refactor(ffi): Call methods on Room instead of redoing the same work

[Hywan]

This patch updates Room::report_content and Room::report_room to call the same methods on matrix_sdk instead of re-implementing them.

---

• Follow up of feat(sdk&ffi): report room api #4713
• Close Add Room.report API #4681

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.79%. Comparing base (b4a8089) to head (3754bd0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4892   +/-   ##
=======================================
  Coverage   85.78%   85.79%           
=======================================
  Files         299      299           
  Lines       35278    35278           
=======================================
+ Hits        30262    30265    +3     
+ Misses       5016     5013    -3     

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