[chore] replace panic with .to_compiler_error in macros

[r3stl355]

Replace panic! with to_compiler_error in macros.

There seem to be no tests for macros, maybe worth adding but probably deserves a separate issue

resolves #348

[zachschuermann]

awesome, thanks @r3stl355! I've just updated the PR description a little bit to make it clearer and tagged some people for review

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 78.80%. Comparing base (6e8bd3e) to head (78b5aeb).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
derive-macros/src/lib.rs	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #409      +/-   ##
==========================================
- Coverage   78.85%   78.80%   -0.06%     
==========================================
  Files          51       51              
  Lines       10640    10647       +7     
  Branches    10640    10647       +7     
==========================================
  Hits         8390     8390              
- Misses       1781     1788       +7     
  Partials      469      469              

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[scovich]

LGTM, thanks!

[nicklan]

This is much nicer thanks! Just a small thing about the formatting.

[nicklan]

thanks!