- Changed `_sqlExecutor` type in `CreateEnvelopeCommandHandler` to non-generic `ISQLExecutor`.
- Updated `Handle` method to use `CreateEnvelopeAsync` for simplified parameter handling.
- Restructured `CreateEnvelopeSQL` to implement `ISQL<Envelope>` with a raw SQL command for creating envelopes.
- Added `SetDappeTypeMap<TModel>` method in `DependencyExtensions` for Dapper type mappings.
- Improved overall code structure for better separation of concerns and maintainability.
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