feat: add Plaid transaction handling and async queue processing

- introduced new migration to add Cursor column to AccountMetadata.
- updated AppDbContext model snapshot to reflect changes in the database schema.
- implemented async queue processing with ChannelAsyncQueue and AsyncQueueHostedService.
- created Plaid transaction handlers for added, modified, and removed transactions.
- developed PlaidTransactionService and PlaidTransactionSyncer for syncing transactions.
- added SyncUpdatesProcessor to handle sync updates from Plaid.
- updated tests to accommodate changes in institution and account metadata handling.

.vscode/settings.json

@@ -10,5 +10,7 @@
     "source.fixAll": "explicit"
   },
   "editor.formatOnSave": true,
-  "editor.defaultFormatter": "esbenp.prettier-vscode"
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "cSpell.words": ["Encryptor"],
+  "python-envs.defaultEnvManager": "ms-python.python:system"
 }