No need to let user write AssertUnwindSafe everywhere

[fzyzcjy]

Changes

Close #1543
Close #1573

Checklist

• An issue to be fixed by this PR is listed above.
• New tests are added to ensure new features are working. Please refer to this page to see how to add a test.
• ./frb_internal precommit --mode slow (or fast) is run (it internal runs code generator, does auto formatting, etc).
• If this PR adds/changes features, documentations (in the ./website folder) are updated.
• CI is passing. Please refer to this page to see how to solve a failed CI.

Remark for PR creator

• ./frb_internal --help shows utilities for development.
• If fzyzcjy does not reply for a few days, maybe he just did not see it, so please ping him.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (44e67a2) 99.23% compared to head (5671cf3) 99.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1574      +/-   ##
==========================================
- Coverage   99.23%   99.23%   -0.01%     
==========================================
  Files         341      341              
  Lines       13276    13268       -8     
==========================================
- Hits        13174    13166       -8     
  Misses        102      102              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.