1. cover old code using tag-8.4.2
2. from this commmit, backport code from past 810
3. more than 842: CODE_OF_CONDUCT.md, README.md, ml
4. ndb using c++20 feature: std::range::any_of() & std::range::none_of(), rollback to c++11 standard std::any_of() & std::none_of() for compile success in mac.
5. init rapid_engine & fix clang-format & fix workflow & disable main.mysql_load_data_local_dir for fail in ci/cd
Briefly describe what this PR aims to solve. Include background context that will help reviewers understand the purpose of the PR.
Fixes #78
Tests
[x] Unit Test
[ ] Logic Test
[ ] Benchmark Test
[ ] No Test - Explain why
Type of change
[ ] Bug Fix (non-breaking change which fixes an issue)
[x] New Feature (non-breaking change which adds functionality)
[ ] Breaking Change (fix or feature that could cause existing functionality not to work as expected)
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Summary
Briefly describe what this PR aims to solve. Include background context that will help reviewers understand the purpose of the PR.
Tests
Type of change