[Paranoid Durability] Add metrics and logs for paranoid durability writes.

[litingulfs]

This PR adds more log statements and metrics to help in evaluating and debugging the performance of the paranoid durability write feature:

• A single metric for when not enough successful writes can be made to satisfy the requirements (i.e. not enough local or remote successful writes).
  • Log messages with additional information to assist in debugging.
• A metric for when there are not enough replicas in total to attempt a paranoid durability write (log messages already exist).

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 47.05882% with 9 lines in your changes missing coverage. Please review.

Project coverage is 70.19%. Comparing base (52ba813) to head (88120c9). Report is 33 commits behind head on master.

Files	Patch %	Lines
...bry/router/ParanoidDurabilityOperationTracker.java	30.76%	6 Missing and 3 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2811 +/- ## ============================================ + Coverage 64.24% 70.19% +5.94% - Complexity 10398 11736 +1338 ============================================ Files 840 842 +2 Lines 71755 72296 +541 Branches 8611 8700 +89 ============================================ + Hits 46099 50748 +4649 + Misses 23004 18887 -4117 - Partials 2652 2661 +9 ```

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