feat: Add fromJson method for Room
Description
Relates to https://gitlab.com/famedly/famedlysdk/-/issues/159 and does some preparations for it. More description is in the commits.
Checklist
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I read the [Contributor Guide] and followed the process outlined there for submitting PRs. -
I signed the CLA -
I updated/added relevant documentation (doc comments with ///). -
I did not add or update methods, functions or widgets without tests.
Edited by Krille-chan