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/PlaidInstitutionMetadata.cs

@@ -0,0 +1,37 @@
+using FiscalOS.Infra.Common;
+
+namespace FiscalOS.Infra.Accounts.Plaid;
+
+public sealed class PlaidInstitutionMetadata : InstitutionMetadata
+{
+  public const string TypeValue = Providers.Plaid;
+  public string PlaidId { get; init; } = string.Empty;
+  public string PlaidName { get; init; } = string.Empty;
+  public string EncryptedAccessToken { get; init; } = string.Empty;
+  public string ItemId { get; init; } = string.Empty;
+
+  private PlaidInstitutionMetadata() : base(TypeValue)
+  {
+  }
+
+  public static PlaidInstitutionMetadata From(
+    string? plaidId,
+    string? plaidName,
+    string encryptedAccessToken,
+    string itemId
+  )
+  {
+    ArgumentNullException.ThrowIfNull(plaidId, nameof(plaidId));
+    ArgumentNullException.ThrowIfNull(plaidName, nameof(plaidName));
+    ArgumentNullException.ThrowIfNull(encryptedAccessToken, nameof(encryptedAccessToken));
+    ArgumentNullException.ThrowIfNull(itemId, nameof(itemId));
+
+    return new()
+    {
+      PlaidId = plaidId,
+      PlaidName = plaidName,
+      EncryptedAccessToken = encryptedAccessToken,
+      ItemId = itemId,
+    };
+  }
+}