Adding additional metrics to java driver

[scottfines]

This adds additional counting metrics to the Java driver.

Code-Reviewer Section

The general guidelines can be found here.

Please check each of the following things and check all boxes before accepting a PR.

• [ ] The PR has a description, explaining both the problem and the solution.
• [ ] The description mentions which forms of testing were done and the testing seems reasonable.
• [ ] Every function/class/actor that was touched is reasonably well documented.

For Release-Branches

If this PR is made against a release-branch, please also check the following:

• [ ] This change/bugfix is a cherry-pick from the next younger branch (younger release-branch or master if this is the youngest branch)
• [ ] There is a good reason why this PR needs to go into a release branch and this reason is documented (either in the description above or in a linked GitHub issue)

[foundationdb-ci]

AWS CodeBuild CI Report

• CodeBuild project: foundationdb-pull-request-build
• Commit ID: e5d5cf600511a2cd8537d2b96283e9fb8b6c430d
• Result: FAILED
• Build Logs (available for 7 days)

[foundationdb-ci]

AWS CodeBuild CI Report

• CodeBuild project: foundationdb-pull-request-build
• Commit ID: bea3e9bc67ce331c7d94698a7b0f0cad094119e3
• Result: FAILED
• Build Logs (available for 7 days)

[foundationdb-ci]

AWS CodeBuild CI Report

• CodeBuild project: foundationdb-pull-request-build
• Commit ID: bea3e9bc67ce331c7d94698a7b0f0cad094119e3
• Result: SUCCEEDED
• Build Logs (available for 7 days)

[jzhou77]

@scottfines, can we close this PR?