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.Infra/Accounts/Plaid/PlaidAccountMetadata.cs

@@ -1,3 +1,6 @@
+
+using FiscalOS.Infra.Common;
+
 namespace FiscalOS.Infra.Accounts.Plaid;
 
 public sealed class PlaidAccountMetadata : AccountMetadata
@@ -5,12 +8,16 @@ public sealed class PlaidAccountMetadata : AccountMetadata
   public const string TypeValue = Providers.Plaid;
   public string PlaidId { get; init; } = string.Empty;
   public string PlaidName { get; init; } = string.Empty;
+  public string? Cursor { get; private set; }
 
   private PlaidAccountMetadata() : base(TypeValue)
   {
   }
 
-  public static PlaidAccountMetadata From(string plaidId, string plaidName)
+  public static PlaidAccountMetadata From(
+    string plaidId,
+    string plaidName
+  )
   {
     return new()
     {
@@ -18,4 +25,11 @@ public sealed class PlaidAccountMetadata : AccountMetadata
       PlaidName = plaidName,
     };
   }
+
+  public void SetCursor(string cursor)
+  {
+    ArgumentException.ThrowIfNullOrWhiteSpace(cursor, nameof(cursor));
+
+    Cursor = cursor;
+  }
 }