Add clang-format script

[sduzh]

run build-support/check-format.sh to check cpp styles;
run build-support/clang-format.sh to fix cpp style issues;

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• Code refactor (Modify the code structure, format the code, etc...)

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[morningman]

Nice work!
Could you please add a README file under build-support to explain how to use these scripts?
And better to update the developer-guide/format-code.md document.

[sduzh]

Nice work!
Could you please add a README file under build-support to explain how to use these scripts?
And better to update the developer-guide/format-code.md document.

updated

[morningman]

LGTM