feat: search tokenization, handling of quoted literal search, and postgres fuzziness (#2351)

* Creating postgres migration script and starting to set up to detect database

* non-working placeholders for postgres pg_tgrm

* First draft of some indexes

* non-working commit of postgres indexing

* Further non-working edits to db-centric fuzzy search

* update alembic for extensions

* More non-working setup

* Move db type check to init_db

* fix typo in db name check

* Add sqlite token search and postgres full text search

* reorder search to hit exact matches faster

* Add settings and docs for POSTGRES_LANGUAGE (full text search)

* Use user-specified POSTGRES_LANGUAGE in search

* fix fuzzy search typo

* Remove full text search and instead order by trigram match

* cleaner adding of indices, remove fulltext

* Cleanup old import of getting app settings

* Fix typo in index

* Fix some alembic fuzzy typos

* Remove diagnostic printing from alembic migration

* Fix mixed up commutator for trigram operator and relax criteria

* forgot to remove query debug

* sort only on name

* token and fuzzy search tests

* Refactor recipe search test to avoid rare random string cross-matches.

* Add ability to quote parts of search for exact match

* Remove internal punctuation, unless it's quoted for literal search

* Add tests for special character removal and literal search

* Remove the outer double quotes from searches, but leave internal single quotes alone.

* Update tests to avoid intra-test name collisions

* Fixing leftovers highlighted by lint

* cleanup linting and mypy errors

* Fix test cross-matching on dirty db (leftovers from bulk import)

* forgot to cleanup something when debugging mypy errors

* re-order pg_trgm loading in postgres

* address comments

docs/docs/documentation/getting-started/faq.md

@@ -68,6 +68,13 @@ Yes, you can install Mealie on your local machine. HOWEVER, it is recommended th
 
 - [Advanced Installation](../installation/advanced/)
 
+## What is fuzzy search and how do I use it?
+Mealie can use fuzzy search, which is robust to minor typos. For example, searching for "brocolli" will still find your recipe for "broccoli soup". But fuzzy search is only functional on a Postgres database backend. To enable fuzzy search you will need to migrate to Postgres:
+
+1. Backup your database and download the .zip file (same as when [migrating](./migrating-to-mealie-v1.md))
+2. Set up a [Postgres](./installation/postgres.md) instance of Mealie
+3. Upload the backup .zip and click to apply it (as as migration)
+
 ## How i can attach an image or video to a Recipe?
 
 Yes. Mealie's Recipe Steps and other fields support the markdown syntax and therefor supports images and videos. To attach an image to the recipe, you can upload it as an asset and use the provided copy button to generate the html image tag required to render the image. For videos, Mealie provides no way to host videos. You'll need to host your videos with another provider and embed them in your recipe. Generally, the video provider will provide a link to the video and the html tag required to render the video. For example, youtube provides the following link that works inside a step. You can adjust the width and height attributes as necessary to ensure a fit.