middleware wrapping tollboth/v8

[umputun]

This PR adds a middleware wrapper for tollbooth/v8 limiter.

The wrapper makes it possible to use the limiter with any router supporting the stdlib http-related signatures. The code is inspired by tollbooth_chi but has several notable differences:

• It works with v8 instead of v7 of the tollbooth.
• The chi dependency has been removed.
• The actual handler code is "inlined" and doesn't need to create an internal limiterWrapper anymore.
• It sets IP lookup to RemoteAddr by default, only if not set by the limiter itself.

[coveralls]

Pull Request Test Coverage Report for Build 12574489619

Details

• 20 of 20 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 88.324%

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Totals
Change from base Build 12447427982:	0.3%
Covered Lines:	764
Relevant Lines:	865

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💛 - Coveralls

[umputun]

this PR is on hold now, waiting for progress on didip/tollbooth#113
if that one is accepted and merged in, we won't need the wrapper on our level

[paskal]

Could change be backported except for logic change to https://github.com/didip/tollbooth_chi once tollbooth change is merged?

[umputun]

Could change be backported except for logic change to https://github.com/didip/tollbooth_chi once tollbooth change is merged?

Not sure what the end goal will be. The change in the tollbooth has already merged and been tagged. This wrapper seems to be fully redundant and not needed anymore, unless I missed the point.

[umputun]

closing without merging, as the upstream accepted direct PR with HTTPMidleware

[paskal]

@umputun we might want to submit a PR to https://github.com/didip/tollbooth_chi stating how to use new HTTPMidleware directly without involving that package.

Also I've missed it initially, but didip/tollbooth#113 didn't update the Readme to mention the new functionality.