Add missing map types

[nikodembernat]

Added missing map types to the MapType enum.

Pre-launch Checklist

• [x] I updated pubspec.yaml with an appropriate new version according to the [pub versioning philosophy].
• [x] I updated CHANGELOG.md to add a description of the change.
• [x] I updated/added relevant documentation (doc comments with ///).
• [x] I added new tests to check the change I am making if a test is possible.
• [x] All existing and new tests are passing.

[nikodembernat]

Hi guys! @renefloor @koozz

I added missing map types and signed the commit, so you can merge it if you have some time. Thanks a lot