Add a linter for the go fix directives

[espadolini]

Welcome

• Yes, I've searched similar issues on GitHub and didn't find any.
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How did you install golangci-lint?

go install

Your feature request related to a problem? Please describe

In Go 1.26, the go fix tool got a new "inline" analyzer (described here) that inlines source code based on //go:fix inline directives on identifiers, typically to replace a deprecated invocation with a better one.

Describe the solution you'd like

It would be nice if there was a linter (with autofix, obviously) to run the go fix -inline analyzer.

Describe alternatives you've considered

Writing a CI step that manually invokes go fix -inline, I suppose.

Additional context

No response

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[alexandear]

Added inline in this PR #6385

[ldez]

I will evaluate the analyzer again, but there are some subtleties with it.