[prism] Support BoundedTrie Metrics

[charlespnh]

Partially addresses #29650
Implementation follows the exact same as in

beam/sdks/python/apache_beam/metrics/cells.py

Line 790 in 840462b

class BoundedTrieData(object):

and

beam/runners/core-java/src/main/java/org/apache/beam/runners/core/metrics/BoundedTrieData.java

Line 4 in 840462b

* distributed with this work for additional information

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[charlespnh]

R: @Abacn @shunping @lostluck

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[charlespnh]

I don't think the current tests failing are related, though might need to rerun to be certain...

[shunping]

Thanks! LGTM on the PR.

Re-running the failed tests now.

[lostluck]

Given the complexity of the implementation, a few more unit tests to ensure coverage would be appreciated to ensure correctness.

The Python implementation has a robust set to crib from:

https://github.com/apache/beam/blob/master/sdks/python/apache_beam/metrics/cells_test.py#L217