feat: add client_settings_override parameter to create_meeting()

[myryk31415]

This allows overriding the html5-client settings.yml options in the create call, for this to work allowOverrideClientSettingsOnCreateCall in /etc/bigbluebutton/bbb-web.properties needs to be set to true.

Documentation of the feature.

pytest ran 0 tests, I didn't find any either. The linter complains about having more than five arguments in the function, any ideas how i could implement this without the extra argument?

This should however not break compatibility since the behaviour stays the same as before if the client_settings_override parameter is not passed.

Regarding data:

• the <![CDATA[ and ]]> could be included in the literal string since it doesn't change
• alternatively the whole string including the <module> parts could be supplied by the caller

is there any preference on how thats handled?

When the technical details are resolved I'm gonna open another pull request to add the feature to the docs