Support providing configuration both by command line and by config file at the same time

[fzyzcjy]

Changes

Close #1596

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 99.12%. Comparing base (3ed6c2f) to head (be52808).
Report is 22 commits behind head on master.

❗ Current head be52808 differs from pull request most recent head 8ec6f39

Please upload reports for the commit 8ec6f39 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2119   +/-   ##
=======================================
  Coverage   99.11%   99.12%           
=======================================
  Files         486      486           
  Lines       19656    19676   +20     
=======================================
+ Hits        19482    19503   +21     
+ Misses        174      173    -1     

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