- Includes Zip321UriBuildFixture for the toUri() method from the Rust layer.
- Includes Zip321UriParseFixture for the fromUri() method from the Rust layer.
- Added ZecRequestTest class for testing ZecRequest methods.
- Align Zip321UriBuildFixture and Zip321UriParseFixture parameters.
- Added comments to the new() methods of Zip321BuildFixture and Zip321ParseFixture.