Refactor SQL handling in EnvelopeGenerator application

- Added `System.Data` using directive in `EnvelopeCreateReadSQL.cs`.
- Updated SQL command strings to use parameter placeholders.
- Corrected method name from `CreateParmas` to `CreateParams` and added output parameter `@OutUid`.
- Made similar updates in `EnvelopeReceiverAddReadSQL.cs`.
- Introduced `ParamsExtensions` class with `ToSqlParam` method for converting .NET objects to SQL-safe parameter strings.

EnvelopeGenerator.Application/SQL/EnvelopeReceiverAddReadSQL.cs

@@ -10,16 +10,16 @@ namespace EnvelopeGenerator.Application.SQL;
 public class EnvelopeReceiverAddReadSQL : ISQL<Envelope>
 {
     /// <summary>
-    /// 
+    /// ENV_UID, EMAIL_ADRESS, SALUTATION, PHONE, 
     /// </summary>
     public string Raw => @"
 		DECLARE	@OUT_RECEIVER_ID int
 
 		EXEC	[dbo].[PRSIG_API_CREATE_RECEIVER]
-				@ENV_UID,
-				@EMAIL_ADRESS,
-				@SALUTATION,
-				@PHONE,
+				{0},
+				{1},
+				{2},
+				{3},
 				@OUT_RECEIVER_ID OUTPUT
 
 		SELECT TOP(1) *