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.

src/FiscalOS.API/Institutions/Link/Endpoint.cs

@@ -12,7 +12,7 @@ internal static class Endpoint
   private static async Task<IResult> HandleAsync(
     HttpContext httpContext,
     [FromServices] AppDbContext appDbContext,
-    [FromServices] PlaidService plaidService
+    [FromServices] IPlaidAccountService plaidAccountService
   )
   {
     var userId = httpContext.GetUserId();
@@ -24,7 +24,7 @@ internal static class Endpoint
       return Results.Unauthorized();
     }
 
-    var linkToken = await plaidService.CreateLinkTokenAsync(user.Id.ToString());
+    var linkToken = await plaidAccountService.CreateLinkTokenAsync(user.Id.ToString());
 
     return Results.Ok(Response.From(linkToken));
   }