Add sigfmt formatter

[AlekSi]

Welcome

• Yes, I've searched similar issues on GitHub and didn't find any.
• I agree to follow this project's Code of Conduct

How did you install golangci-lint?

Other

Your feature request related to a problem? Please describe

I would like golangci-lint to have a formatter for function signatures. I found two that look okay:

• https://github.com/feedr-aps/sigfmt
• https://github.com/SaintMaximov/gosigfmt

I tried the first one, and it works. Having it integrated into golangci-lint would be great.

That issue is unrelated to another project with the same name from #6242.

Describe the solution you'd like

See above.

Describe alternatives you've considered

Running github.com/feedr-aps/sigfmt manually.

Additional context

No response

Supporter

• I am a sponsor/backer of this project.

[bombsimon]

Thanks for the proposal. There is a new linter proposals template for discussions which is a better way to discuss new linters since the template contains a bunch of questions helping us. Also it's a good place to keep linter integration requests since they'll end up in the New Linter Proposals section that gives a good overview.

[AlekSi]

Should it also be used for formatters, though? The description does not mention that.

[AlekSi]

The template also seems to assume that I want to propose my linter with items like "I understand that tags must never be deleted or recreated once published", but that's not the case.