- Updated `EnvelopeReceiverExecutor` to inherit from `SQLExecutor` and added `_erRepository` for enhanced data access.
- Introduced `AddEnvelopeReceiverAsync` method for retrieving envelope receivers.
- Modified `ReadById` in `EnvelopeReceiverRepository` to support flexible querying with new parameters.
- Updated `ReadByIdAsync` to align with changes in `ReadById`.
Updated DIExtensions to register IEnvelopeExecutor as a singleton and added IEnvelopeReceiverExecutor as a new singleton service. Introduced IEnvelopeReceiverExecutor interface and implemented it in the new EnvelopeReceiverExecutor class for future envelope processing functionality.