[WIP on-hold] Reimplement metric store in pure java

[andsel]

Release notes

What does this PR do?

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

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

Author's Checklist

• move all metric_store_spec.rb to cover the Java MetricStore
• move the Collector and collector_spec.rb

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[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

[elasticmachine]

💔 Build Failed

• Buildkite Build
• Commit: a516861

Failed CI Steps

• :rspec: Ruby unit tests
• :rspec: Ruby unit tests
• :rspec: Ruby unit tests
• :rspec: Ruby unit tests
• Observability SRE container smoke test
• Observability SRE container smoke test
• Observability SRE container smoke test
• Observability SRE container smoke test
• 🥼 Integration Tests - FIPS mode / part 4-of-6
• 🥼 Integration Tests - FIPS mode / part 4-of-6
• 🥼 Integration Tests - FIPS mode / part 4-of-6
• 🥼 Integration Tests - FIPS mode / part 4-of-6
• 🥼 Integration Tests / part 4-of-6
• 🥼 Integration Tests / part 4-of-6
• 🥼 Integration Tests / part 4-of-6
• 🥼 Integration Tests / part 4-of-6
• 🥼 IT Persistent Queues / part 4-of-6
• 🥼 IT Persistent Queues / part 4-of-6
• 🥼 IT Persistent Queues / part 4-of-6
• 🥼 IT Persistent Queues / part 4-of-6

History

• 💔 Build #4060 failed 7ecffde
• 💔 Build #4037 failed 3a9327e
• 💔 Build #3214 failed 6beaf90