chore(ffi): silence useless logs coming out of the ffi crate

[stefanceriu]

Setting the default log level to debug results in logs like:

log: log_event
log: latest_event
log: log_event
log: log_event
log: room_info
log: latest_event
log: log_event
log: room_info

Presumably they're coming out of the custom tracing configuration and we definitely don't need them

[poljar]

Ah, it's telling you which function is called or something like that.

Makes sense.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.42%. Comparing base (c969f90) to head (803d447).
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4542      +/-   ##
==========================================
- Coverage   85.43%   85.42%   -0.01%     
==========================================
  Files         285      285              
  Lines       32112    32112              
==========================================
- Hits        27435    27433       -2     
- Misses       4677     4679       +2     

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