feat: add .gitattributes to unify different platforms eol

[iyear]

Pre-Checklist

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• I have read through the CONTRIBUTING.md documentation.
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• I have added relevant tests

Description

Maybe it's a breaking change.
Windows users may have all files changed after pulling the latest code, so just delete all files except .gitattributes .git and roll them back to reset the eol.Or nothing may happen, just make sure to show the eol of all text files as LF in the IDE

Add .gitattributes to unify different platforms eol

Related Issues

#541

New Behavior (screenshots if needed)

After I run make fmt in WSL, no file changed.

[iyear]

And now it's LF in Goland.

[daniel-hutao]

close #541

/cc @iyear Please see the document here about how to close a issue with comment. And remember close the issue with pr comment next time.

[iyear]

@daniel-hutao @IronCore864 Thanks for the review and help! My mistake:(, I will pay attention next time.

Related Links: https://stackoverflow.com/questions/729692/why-should-text-files-end-with-a-newline