QueryCompiler collision issues?

[rcaudy]

See:
https://gitlab.deephaven.io/illumon/iris/-/merge_requests/6879/diffs

We should reproduce and port the fix if appropriate. It's apparently easy to repro by changing the packageNameSuffix calculation, as in:

final String packageNameSuffix = "c" + pi + "v" + JAVA_CLASS_VERSION;

Note that the improved hash in the code to port is not an essential part of the fix, it just reduces the probability of collisions. The key is not allowing a duplicate result.