Refactor envelope handling to use ISQLExecutor

This commit removes the IEnvelopeExecutor interface and its implementation, replacing it with ISQLExecutor. The CreateEnvelopeAsync method in Extension.cs now directly creates DynamicParameters. The CreateEnvelopeCommandHandler has been updated to utilize ISQLExecutor. Additionally, the EnvelopeExecutor class has been removed, and a new SQL command class, EnvelopeReceiverCreateReadSQL, has been added for managing envelope receiver SQL operations.

EnvelopeGenerator.Application/Envelopes/Commands/CreateEnvelopeCommandHandler.cs

@@ -9,18 +9,18 @@ namespace EnvelopeGenerator.Application.Envelopes.Commands;
 /// </summary>
 public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeCommand, CreateEnvelopeResponse?>
 {
-    private readonly IEnvelopeExecutor _envelopeExecutor;
+    private readonly ISQLExecutor _executor;
 
     private readonly IMapper _mapper;
 
     /// <summary>
     /// 
     /// </summary>
-    /// <param name="envelopeExecutor"></param>
+    /// <param name="executor"></param>
     /// <param name="mapper"></param>
-    public CreateEnvelopeCommandHandler(IEnvelopeExecutor envelopeExecutor, IMapper mapper)
+    public CreateEnvelopeCommandHandler(ISQLExecutor executor, IMapper mapper)
     {
-        _envelopeExecutor = envelopeExecutor;
+        _executor = executor;
         _mapper = mapper;
     }
 
@@ -34,7 +34,7 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
     {
         int userId = request.UserId ?? throw new InvalidOperationException("UserId cannot be null when creating an envelope.");
 
-        var envelope = await _envelopeExecutor.CreateEnvelopeAsync(userId, request.Title, request.Message, request.TFAEnabled, cancellationToken);
+        var envelope = await _executor.CreateEnvelopeAsync(userId, request.Title, request.Message, request.TFAEnabled, cancellationToken);
 
         return _mapper.Map<CreateEnvelopeResponse>(envelope);
     }