Remove obsoleted PrometheusRSocketClient-based MeterRegistryProvider

[bryceatmoderne]

What's changed?

• removed consumers of PrometheusRSocketClient and related dependencies
• removed plugin properties rewrite.metricsUri, rewrite.metricsUsername and rewrite.mertricsPassword

What's your motivation?

This dependency is no longer required and indirectly contains a vulnerability from https://mvnrepository.com/artifact/org.xerial.snappy/snappy-java

Anything in particular you'd like reviewers to focus on?

No

Anyone you would like to review specifically?

@knutwannheden

Have you considered any alternatives or workarounds?

No

Any additional context

Vulnerable dependency https://mvnrepository.com/artifact/org.xerial.snappy/snappy-java/1.1.10.1

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[knutwannheden]

LGTM!

[github-actions]

Some suggestions could not be made:

• pom.xml
  • lines 199-199