Add java priority queue coder

[kellen]

When using e.g. algebird PriorityQueueMonoid, scio needs to serialize java PriorityQueues. If Kryo is used, especially for small queues, there can be significant overhead.

Instead, this PR provides a PriorityQueue coder backed by a scala Ordering (as indeed the monoid is).

The coder must be created explicitly by the user so that they are asserting that the comparator of the original PriorityQueues and the reconstituted ones are the same. e.g.

implicit val pqCoder = Coders.jPriorityQueueCoder[T](ord)

@RustedBones Is there some trick I can use to get an error message when Coder[java.util.PriorityQueue[T]] fails to be derived (that's not just the generic implicitNotFound on Coder)?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.44%. Comparing base (0a450e9) to head (e8c0616).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5520      +/-   ##
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+ Coverage   61.43%   61.44%   +0.01%     
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  Files         312      312              
  Lines       11103    11107       +4     
  Branches      762      778      +16     
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+ Hits         6821     6825       +4     
  Misses       4282     4282              

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