- Removed parameters from ReadReceiverNameQuery, simplifying its structure.
- Added null check for EmailAddress in GetReceiverName method to enhance input validation.
- Updated `EnvelopeReceiverQuery` to include an optional, nullable `Status` parameter.
- Modified `ReadEnvelopeReceiverQuery` to inherit from the updated `EnvelopeReceiverQuery`.
- Added new using directives in `EnvelopeReceiverController` and enhanced response documentation to include a 401 Unauthorized response.
- Implemented authorization for the `GetEnvelopeReceiver` method.
- Improved documentation and method signature for `GetReceiverName` to accept a `ReadReceiverNameQuery` object.
- Introduced a new `ReadReceiverNameQuery` record for querying the last used salutation of a receiver.
