[FEAT]Allow changing git notes (#4753)

Git has a cool feature called git notes. It allows adding a text to a commit without changing the commit itself. Forgejo already displays git notes. With this PR you can also now change git notes.

<details>
<summary>Screenshots</summary>

![grafik](/attachments/53a9546b-c4db-4b07-92ae-eb15b209b21d)
![grafik](/attachments/1bd96f2c-6178-45d2-93d7-d19c7cbe5898)
![grafik](/attachments/9ea73623-25d1-4628-a43f-f5ecbd431788)
![grafik](/attachments/efea0c9e-43c6-4441-bb7e-948177bf9021)

</details>

## Checklist

The [developer guide](https://forgejo.org/docs/next/developer/) contains information that will be helpful to first time contributors. There also are a few [conditions for merging Pull Requests in Forgejo repositories](https://codeberg.org/forgejo/governance/src/branch/main/PullRequestsAgreement.md). You are also welcome to join the [Forgejo development chatroom](https://matrix.to/#/#forgejo-development:matrix.org).

### Tests

- I added test coverage for Go changes...
  - [ ] in their respective `*_test.go` for unit tests.
  - [x] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- I added test coverage for JavaScript changes...
  - [ ] in `web_src/js/*.test.js` if it can be unit tested.
  - [ ] in `tests/e2e/*.test.e2e.js` if it requires interactions with a live Forgejo server (see also the [developer guide for JavaScript testing](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/e2e/README.md#end-to-end-tests)).

### Documentation

- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.

### Release notes

- [ ] I do not want this change to show in the release notes.
- [x] I want the title to show in the release notes with a link to this pull request.
- [ ] I want the content of the `release-notes/<pull request number>.md` to be be used for the release notes instead of the title.

<!--start release-notes-assistant-->

## Release notes
<!--URL:https://codeberg.org/forgejo/forgejo-->
- Features
  - [PR](https://codeberg.org/forgejo/forgejo/pulls/4753): <!--number 4753 --><!--line 0 --><!--description QWxsb3cgY2hhbmdpbmcgZ2l0IG5vdGVz-->Allow changing git notes<!--description-->
<!--end release-notes-assistant-->

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/4753
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: JakobDev <jakobdev@gmx.de>
Co-committed-by: JakobDev <jakobdev@gmx.de>

templates/swagger/v1_json.tmpl

@@ -7375,6 +7375,101 @@
             "$ref": "#/responses/validationError"
           }
         }
+      },
+      "post": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "repository"
+        ],
+        "summary": "Set a note corresponding to a single commit from a repository",
+        "operationId": "repoSetNote",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "owner of the repo",
+            "name": "owner",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "name of the repo",
+            "name": "repo",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "a git ref or commit sha",
+            "name": "sha",
+            "in": "path",
+            "required": true
+          },
+          {
+            "name": "body",
+            "in": "body",
+            "schema": {
+              "$ref": "#/definitions/NoteOptions"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "$ref": "#/responses/Note"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
+          }
+        }
+      },
+      "delete": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "repository"
+        ],
+        "summary": "Removes a note corresponding to a single commit from a repository",
+        "operationId": "repoRemoveNote",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "owner of the repo",
+            "name": "owner",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "name of the repo",
+            "name": "repo",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "a git ref or commit sha",
+            "name": "sha",
+            "in": "path",
+            "required": true
+          }
+        ],
+        "responses": {
+          "204": {
+            "$ref": "#/responses/empty"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
+          }
+        }
       }
     },
     "/repos/{owner}/{repo}/git/refs": {
@@ -24601,6 +24696,16 @@
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
     },
+    "NoteOptions": {
+      "type": "object",
+      "properties": {
+        "message": {
+          "type": "string",
+          "x-go-name": "Message"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "NotificationCount": {
       "description": "NotificationCount number of unread notifications",
       "type": "object",
@@ -28350,7 +28455,7 @@
     "parameterBodies": {
       "description": "parameterBodies",
       "schema": {
-        "$ref": "#/definitions/SetUserQuotaGroupsOptions"
+        "$ref": "#/definitions/NoteOptions"
       }
     },
     "quotaExceeded": {