chore: run gofumpt + modernize

[andreynering]

This PR adds two commits with formatting / linting changes only. Behavior should be intact.

• style: run gofumpt
• style: run modernize

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[Sivasankaran25]

Hi @andreynering
Thanks for your contributions!
Kindly update the description.
Thank you!

[andreynering]

Hi @Sivasankaran25. Thanks for taking a look!

I added a description linking the tool in ran in the codebase.

I also rebased to fix a conflict.

[qiaodev]

Hi @andreynering

May I know the exact command you ran for this PR? Because many files are auto generated and I need to implement the command in our internal generator as well.

Thanks.

[andreynering]

@qiaodev

• gofumpt -w .
• modernize -fix -test ./...

[qiaodev]

Actually this is non-trivial to support running gofumpt and modernize in google internal code base.

@andreynering Is it important? Or nice to have? Thanks

[andreynering]

@qiaodev It's up to you, but my personal opinion is that gofumpt is quite popular, so it'd be nice to use it.

The reason I cared opening this PR is because my editor runs gofumpt by default on every save, so I got unrelated changes when working on #526.

Of course, I can temporarily disable that in this codebase if I have no other option.