sdk: create new users_with_power_levels fn

[jmartinesp]

It maps user ids to users' power levels.

Also, make sure it just returns an empty map if this info is not available, instead of crashing.

Then use it in the FFI side to output updated data for the RoomInfo.

• Public API changes documented in changelogs (optional)

Signed-off-by:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.81%. Comparing base (4b56ca1) to head (49830c8).
Report is 1381 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3182      +/-   ##
==========================================
+ Coverage   83.78%   83.81%   +0.02%     
==========================================
  Files         232      232              
  Lines       23958    23965       +7     
==========================================
+ Hits        20074    20086      +12     
+ Misses       3884     3879       -5     

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[bnjbvr]

Thanks! Tiny comments here :-)

[bnjbvr]

Can you make it so that the test data contains power levels for two different users?

[jmartinesp]

I guess I can change the DEFAULT_SYNC contents, but I'm afraid that might break some other tests.

[bnjbvr]

Without changing the contents of DEFAULT_SYNC, could we return our own content from a json!() macro invoke instead?

[jmartinesp]

I created a new ADMIN_AND_MOD_SYNC with only the needed data for the test.

[bnjbvr]

Thanks!

[jmartinesp]

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