refactor: add Configurable trait

[zyy17]

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What's changed and what's your intention?

Add the Configurable trait to make configuration more general.

1. Add the new module error.rs and config.rs in common/config. Most of the code are from cmd/:

   • The load_layer_options() is from the original cmd/options.rs;
   • The errors are from cmd/error.rs;

2. Add merge_with_cli_options() to make load_options() more simple;

3. Implement Configurable trait and changed some tests for {DatanodeOptions, FrontendOptions, MetasrvOptions, StandaloneOptions};

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

[codecov]

Codecov Report

Attention: Patch coverage is 95.29915% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 85.47%. Comparing base (15d7b97) to head (e6ec8ee).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3917      +/-   ##
==========================================
- Coverage   85.77%   85.47%   -0.30%     
==========================================
  Files         968      969       +1     
  Lines      166463   166503      +40     
==========================================
- Hits       142782   142319     -463     
- Misses      23681    24184     +503     

[zyy17]

@evenyag PTAL