Removal of Ruby bridge classes for Gauge and Counter

[andsel]

Release notes

[rn:skip]

What does this PR do?

• Update Collector#push to avoid dynamic dispatch of method invocation, explicitly invoke set on Gauge and increment on Counter.
• Remove Ruby classes Gauge and Counter replacing by existing Java classes LongCounter and LazyDelegatingGauge which was wrapped by Ruby ones.

Why is it important/What is the impact to the user?

As a developer I want to have less context switch as possible when navigating metrics collection code.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files (and/or docker env variables)
• [ ] I have added tests that prove my fix is effective or that my feature works

Related issues

• Relates [Meta] Implement metrics that exposes batch size and count of contained events #17838

[github-actions]

🤖 GitHub comments

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Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label. Could you fix it @andsel? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• If no backport is necessary, please add the backport-skip label

[jsvd]

minor code style suggestion, otherwise lgtm

[jsvd]

LGTM once CI is green

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: a3ea2ff

History

• 💔 Build #3235 failed 74d2781
• 💛 Build #3184 was flaky e11b2cb
• 💔 Build #3183 failed 7546d13

cc @andsel