[CURATOR-653] Proposed changes based on PR #398

[XComp]

This closes #398.

This PR is based on PR #398 and adds a few comments from my review of that PR

This PR addresses the review comments individually in separate commits to make it easier to select the ones that are relevant. The final commit is a proposal where I refactor using plain Strings in the eventQueue but rather proper objects that enables us to monitor the latch that triggered the event.

[XComp]

2022-10-10T13:50:53.7756841Z [INFO] Running org.apache.curator.framework.recipes.cache.TestPathChildrenCache
2022-10-10T15:00:44.1920989Z ##[error]The operation was canceled.

hm, looks like CI ran into a timeout exceeding the maximum threshold for a CI run of 120min due to TestPathChildrenCache 🤔 I cannot reproduce it locally. But from a brief look, it seems to be unrelated to this PR's change. No LeaderLatch is used. The original PR #398 didn't fail.

[XComp]

The timeout of {{TestPathChildrenCache}} in the Java 11 CI job seems to be unrelated to this PR's change: It doesn't utilize LeaderLatch as far as I can see. I created CURATOR-657 to cover this test instability

[tisonkun]

LGTM.

@eolivelli you may take a looks at this patch which I think is identical to #398.

We may not always wait for new patches so it's on you when to cut the release. I'll regard this patch and #435 are both not blockers.

[tisonkun]

Merging...