Support type char

[fzyzcjy]

Changes

Close #1935

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 ✅

Project coverage is 99.22%. Comparing base (51954da) to head (9023ed2).
Report is 39 commits behind head on master.

❗ Current head 9023ed2 differs from pull request most recent head ec6a0e3

Please upload reports for the commit ec6a0e3 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1957      +/-   ##
==========================================
- Coverage   99.22%   99.22%   -0.01%     
==========================================
  Files         371      369       -2     
  Lines       15841    15829      -12     
==========================================
- Hits        15719    15707      -12     
  Misses        122      122              

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