Add support for centralized package manager & language abstraction fo…

[amazimbe]

…r maven

What are you trying to accomplish?

Update the maven ecosystem to add support for gathering ecosystem metrics that need to be persisted in datadog via POST /update_jobs/:id/record_ecosystem_meta

Anything you want to highlight for special attention from reviewers?

This is one in a series of PRs to gather ecosystem meta data and persist it in datadog. See earlier PRs for Bundler and NPM

In this PR, I'm returning NOT-AVAILABLE for the maven version and java version. From my investigations thus far, there is no consistent way to gather this data as we don't actually run maven when generating dependabot updates. All the processing seems to be done in Ruby. As discussed with @kbukum1 and @abdulapopoola I've created Issue-7534 to track this issue.

How will you know you've accomplished your goal?

• I'll be able to see maven ecosystem metrics in datadog

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.