Fix leak in port deallocation

Perf script improvements

Let execution contexts signal that they are done

Break PARALLELISM test constant in two

Reworked python health checking and added tests

Allow for multiline #endif guards

Fixed usage of anon namespace inside .h

Fix accelerated wakeups

"sooner" -> "server" typo correction

use LANG_ENGLISH for windows api FormatMessage

Add a grpc_recycle_unused_port to return pick_unused_port ports to the portserver

"... will not have the effect of stopping the sooner later", heh. :-P

We can end up in situations where a pollset needs to kick itself.

This is supposed to be an accelerated codepath, however a bug crept in
whereby we missed the opportunity to do so, resulting in needing to
round trip these wakeups redundantly through the OS and wake other
threads unnecessarily.

Going forward we'd like to be able to test much larger numbers of RPCs
than the number of threads available to a test.

Fix large_metadata_bad_client_test to avoid C99 string literal length limit.

grpc_pick_unused_port a lot.

Also actually add the port parameter to grpc_recycle_unused_port.

Also remove the downsizing gpr_realloc in the recycle codepath, which is
unnecessary and can free the pointer.

Fix stress test JVM Args

Add copyrights to .bat files (and update the checker to report missing ones)

Add reflection.proto

Splitting out a pure poll() based event engine

prepare to enable ubsan in continuous build

De-💩ify code

Better compression docs and names