Catch execeptions from callbacks since it might cause a crash

[azeey]

🦟 Bug fix

Summary

Any exception by a callback might cause a crash in gz-sim (see gazebosim/harmonic_demo#14 (comment)), so it's best to catch it here and print a traceback.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #443 (6d94adf) into gz-transport13 (d92aed2) will decrease coverage by 0.13%.
Report is 1 commits behind head on gz-transport13.
The diff coverage is n/a.

❗ Current head 6d94adf differs from pull request most recent head 00d393d. Consider uploading reports for the commit 00d393d to get more accurate results

@@                Coverage Diff                 @@
##           gz-transport13     #443      +/-   ##
==================================================
- Coverage           87.76%   87.64%   -0.13%     
==================================================
  Files                  59       59              
  Lines                5696     5696              
==================================================
- Hits                 4999     4992       -7     
- Misses                697      704       +7     

see 1 file with indirect coverage changes