feature: Migrate Prometheus Middleware to Contrib

[gaby]

TODO:

• Add config struct
• Add support for response/request size metrics
• Refactor metrics to match native golang
• Update README
• Simplify usage of Middleware
• Make Prometheus built-in collectors configurable via config. Example the GoRuntime collector.

Original middleware created and contributed by https://github.com/ansrivas/fiberprometheus

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[ReneWerner87]

@gaby is it ready for review ?

[gaby]

@gaby is it ready for review ?

This weekend :-)

[Fesaa]

Hello! Is there any update on a timeframe to merging this?

[gaby]

@Fesaa Hopefully soon, I did some changes upstream that need to be merged here. I also wanted to simplify the middleware a bit.

The other thing I wanted to probably do is add an option for exporting Host metrics using this https://github.com/prometheus/node_exporter

[gaby]

@Fesaa Now that I thinj about maybe initial release is as it is right now. For next release I can do changes/features. That way we can get this released soon

[ReneWerner87]

LGTM, @gaby ready for merge ?

[gaby]

With the recent changes in ansrivas/fiberprometheus#221 I have to migrate those to this PR and it should be ready to merged.

For v3 we can change the interface to match the other middlewares.