Add sample and check to FunnelBaseAggregationFunction

[vrajat]

Fix for #15249

The PR adds a sample call to FunnelBaseAggregationFunction.java

A test is also added. PerQueryCPUMemResourceUsageAccountant clears state at the end of a query.
It cannot be used in tests to check if resources are being accounted. This class is a simple extension of PerQueryCPUMemResourceUsageAccountant that aggregates memory usage by query id.

Note that this is useful only in simple scenarios when one query is running.
This class has to be defined in the accounting package so that base & server starter classes can find it. It is not meant to be used outside of tests.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.63%. Comparing base (59551e4) to head (b8cfcd8).
Report is 1835 commits behind head on master.

Files with missing lines	Patch %	Lines
...n/funnel/window/FunnelBaseAggregationFunction.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #15251      +/-   ##
============================================
+ Coverage     61.75%   63.63%   +1.88%     
- Complexity      207     1461    +1254     
============================================
  Files          2436     2772     +336     
  Lines        133233   156248   +23015     
  Branches      20636    23981    +3345     
============================================
+ Hits          82274    99436   +17162     
- Misses        44911    49335    +4424     
- Partials       6048     7477    +1429     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (+99.99%)	⬆️
integration	100.00% <ø> (+99.99%)	⬆️
integration1	100.00% <ø> (+99.99%)	⬆️
integration2	0.00% <ø> (ø)
java-11	63.61% <0.00%> (+1.90%)	⬆️
java-21	63.51% <0.00%> (+1.89%)	⬆️
skip-bytebuffers-false	63.63% <0.00%> (+1.88%)	⬆️
skip-bytebuffers-true	63.50% <0.00%> (+35.77%)	⬆️
temurin	63.63% <0.00%> (+1.88%)	⬆️
unittests	63.63% <0.00%> (+1.88%)	⬆️
unittests1	56.19% <0.00%> (+9.30%)	⬆️
unittests2	34.17% <0.00%> (+6.44%)	⬆️

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