🐛 requestid.Config.ContextKey is interface{}

[benjajaja]

Description

#2143 allows to use any as key for c.Locals(key, v). The RequestID middleware should be consistent with that.
This allows to use a custom type for context keys, like for other keys. The RequestID is likely read back somewhere else along other context keys.

Fixes #2356

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation - /docs/ directory for https://docs.gofiber.io/
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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[benjajaja]

fixed linter errors, but don't know about some tests failing, seems unrelated 🤔

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