[ENHANCEMENT] Moving the baseline to JDK 11 and moving to Jetty 11

[azagniotov]

This ticket is to capture PRs made as a result of moving the baseline (i.e.: master branch to JDK 11) and migrating the library to Jetty 11 in order to continue benefit from the latest features that do not end up in jetty v9.x.x

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Given the limited bandwidth of the team, it will be automatically closed if no further activity occurs. Thank you for your contribution.

[stale]

This issue has been automatically closed due to inactivity. If you can reproduce this on a recent version of stubby4j or if you have a good use case for this feature, please feel free to reopen the issue with steps to reproduce, a quick explanation of your use case or a high-quality pull request.