Add logs about errors during adding peer

[Rados13]

Acknowledging the stipulations set forth:

• [ ] I hereby confirm that a Pull Request involving updates to the Software Development Kit (SDK) has been smoothly merged, currently awaits processing, or is otherwise deemed unnecessary in this context.
• [ ] I also affirm that another Pull Request, specifically addressing updates to the documentation body (commonly referred to as 'docs'), has either been successfully incorporated, is in the process of review, or is considered superfluous under the prevailing circumstances.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 84.61538% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 87.19%. Comparing base (07a89a9) to head (070852c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #191      +/-   ##
==========================================
+ Coverage   86.89%   87.19%   +0.30%     
==========================================
  Files          77       77              
  Lines        1549     1570      +21     
==========================================
+ Hits         1346     1369      +23     
+ Misses        203      201       -2     

Files	Coverage Δ
lib/fishjam_web/controllers/fallback_controller.ex	100.00% <100.00%> (ø)
lib/fishjam_web/controllers/peer_controller.ex	100.00% <100.00%> (ø)
lib/fishjam/room_service.ex	83.78% <60.00%> (-1.73%)	:arrow_down:
lib/fishjam_web/controllers/room_controller.ex	94.87% <33.33%> (-5.13%)	:arrow_down:

... and 3 files with indirect coverage changes

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[roznawsk]

Do we want to merge this PR?