perf(callstack): Working set query backed by native thread pool

[rabbitstack]

What is the purpose of this PR / why it is needed?

Introduce a fixed-size native OS thread pool to isolate QueryWorkingSetEx from the Go scheduler. Each worker thread loops on WaitForMultipleObjects([in, quit]) so the pool can be shut down cleanly without TerminateThread, returning locked goroutines and OS threads to the runtime on close.

What type of change does this PR introduce?

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/kind feature (non-breaking change which adds functionality)

/kind bug-fix (non-breaking change which fixes an issue)

/kind refactor (non-breaking change that restructures the code, while not changing the original functionality)

/kind breaking (fix or feature that would cause existing functionality to not work as expected

/kind cleanup

/kind improvement

/kind design

/kind documentation

/kind other (change that doesn't pertain to any of the above categories)

Any specific area of the project related to this PR?

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/area instrumentation

/area telemetry

/area rule-engine

/area filters

/area yara

/area event

/area captures

/area alertsenders

/area outputs

/area rules

/area filaments

/area config

/area cli

/area tests

/area ci

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Special notes for the reviewer

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Does this PR introduce a user-facing change?

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