Add security prices provider (Synth integration) (#1039)

* User tickers as primary lookup symbol instead of isin

* Add security price provider

* Fetch security prices in bulk to improve sync performance

* Fetch prices in bulk, better mocking for tests

test/vcr_cassettes/synth/exchange_rate.yml

@@ -0,0 +1,69 @@
+---
+http_interactions:
+- request:
+    method: get
+    uri: https://api.synthfinance.com/rates/historical?date=2024-08-01&from=USD&to=MXN
+    body:
+      encoding: US-ASCII
+      string: ''
+    headers:
+      User-Agent:
+        - Faraday v2.10.0
+      Authorization:
+      - Bearer <SYNTH_API_KEY>
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Date:
+        - Thu, 01 Aug 2024 17:20:28 GMT
+      Content-Type:
+      - application/json; charset=utf-8
+      Transfer-Encoding:
+        - chunked
+      Connection:
+      - keep-alive
+      Cf-Ray:
+        - 8ac77fbcc9d013ae-CMH
+      Cf-Cache-Status:
+      - DYNAMIC
+      Cache-Control:
+      - max-age=0, private, must-revalidate
+      Etag:
+        - W/"668c8ac287a5ff6d6a705c35c69823b1"
+      Strict-Transport-Security:
+      - max-age=63072000; includeSubDomains
+      Vary:
+      - Accept-Encoding
+      Referrer-Policy:
+      - strict-origin-when-cross-origin
+      Rndr-Id:
+        - ff56c2fe-6252-4b2c
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - SAMEORIGIN
+      X-Permitted-Cross-Domain-Policies:
+      - none
+      X-Render-Origin-Server:
+      - Render
+      X-Request-Id:
+        - 61992b01-969b-4af5-8119-9b17e385da07
+      X-Runtime:
+        - '0.369358'
+      X-Xss-Protection:
+      - '0'
+      Server:
+      - cloudflare
+      Alt-Svc:
+      - h3=":443"; ma=86400
+    body:
+      encoding: ASCII-8BIT
+      string: '{"data":{"date":"2024-08-01","source":"USD","rates":{"MXN":18.645877}},"meta":{"total_records":1,"credits_used":1,"credits_remaining":248999}}'
+  recorded_at: Thu, 01 Aug 2024 17:20:28 GMT
+recorded_with: VCR 6.2.0