CNDB-15527: Add config to use FusedADC

[michaeljmarshall]

What is the issue

https://github.com/riptano/cndb/issues/15527

What does this PR fix and why was it fixed

This is a draft, pushing up to save progress

[github-actions]

Checklist before you submit for review

• This PR adheres to the Definition of Done
• Make sure there is a PR in the CNDB project updating the Converged Cassandra version
• Use NoSpamLogger for log lines that may appear frequently in the logs
• Verify test results on Butler
• Test coverage for new/modified code is > 80%
• Proper code formatting
• Proper title for each commit staring with the project-issue number, like CNDB-1234
• Each commit has a meaningful description
• Each commit is not very long and contains related changes
• Renames, moves and reformatting are in distinct commits
• All new files should contain the DataStax copyright header instead of the Apache License one

[michaeljmarshall]

@marianotepper - I just noticed that the features map already has logic that loads the ProductQuantization, meaning this branch currently keeps two identical maps in memory. I think it'd make sense to possibly expose the features map in the OnDiskGraphIndex so we can remove the duplicate cost. Any reason we can't do that?

[michaeljmarshall]

Looks like we actually already use the one from the header, I just didn't catch it. I think we'll be able to get rid of it with a little extra work in CC.