Allow use of either MP Metrics or Micrometer

[ebullient]

Allow smallrye-fault-tolerance to use either MP Metrics or Micrometer.

• Make MP Metrics an optional/compile dependency
• Add Micrometer as an optional/compile dependency

[ebullient]

Done after/atop #264

[Ladicek]

Does the issue express an intent to work on $SUBJ, or is it just an ask for me to do it?

(If the former, please feel free to ping me any time, but I see you already noticed #264, which largely centralized all the metrics to a few isolated classes. I don't know anything about Micrometer, but I'd naively expect that a new implementation of MetricsRecorder should be enough. Plus a small modification to MetricsProvider.create.)

[ebullient]

I will work on it. ;) No ask from you... other than a review to make sure I'm not doing stupid things. ;)

[Ladicek]

In that case please use the next branch, it has the metrics refactoring and a few other improvements already. I keep it separate from master in case we need to do another release of SRye FT before MP FT 3.0 is done.

[ebullient]

I will start there, and then sort out with Ken if we need it for Quarkus earlier

[kenfinnigan]

@Ladicek have we reached a point where "next" can become master?

[Ladicek]

next implements MP Fault Tolerance 3.0, so until MP FT 3.0 is released, it needs to stay next. Nothing prevents submitting PRs against it, though.

[Ladicek]

Note to self: need to consider quarkusio/quarkus#24597