Refactor envelope and history query structures

- Removed `Sender` parameter and properties from `EnvelopeQuery`.
- Deleted `SenderQuery` class entirely.
- Cleaned up `HistoryQuery` by removing unused `using` directives and `ReferenceType` logic.
- Added `Related` parameter to `ReadHistoryQuery` for reference type indication.
- Updated `ReferenceType` enum in `Constants.vb` to use explicit integer values.
- Modified `HistoryController` to utilize the new `Related` property for determining sender/receiver inclusion.

EnvelopeGenerator.Common/Constants.vb

@@ -32,7 +32,7 @@
 
     'TODO: standardize in xwiki
     Public Enum ReferenceType
-        Receiver
+        Receiver = 0
         Sender
         System
         Unknown