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test: add test for effect of UV_THREADPOOL_SIZE

Rodrigo Muino Tomonari requested to merge github/fork/tniessen/test-uv-threadpool-size into main

This (not particularly elegant) native addon tests the effect of UV_THREADPOOL_SIZE on node-api. The test fails if Node.js allows more than UV_THREADPOOL_SIZE async tasks to run concurrently, or if it limits the number of concurrent async tasks to anything less than UV_THREADPOOL_SIZE.

The test schedules UV_THREADPOOL_SIZE + 1 async tasks and waits until UV_THREADPOOL_SIZE tasks are running concurrently. (If this never happens, the test times out.) All UV_THREADPOOL_SIZE tasks then wait for a second to see if the last task also starts running concurrently, which should not happen.

Admittedly, I hastily put this together and the code is sloppy. While having this test is good in any case, the main motivation is such that @anonrig can invoke the test from his own test in https://github.com/nodejs/node/pull/48890.

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