Adds support for system AEC flag on Windows

This CL:

Checks the feature flag EnforceSystemEchoCancellation on Windows and
adds AudioParameters::ECHO_CANCELLER to the input device parameters if
the flag is enabled during device enumeration.

Checks audio parameters for AudioParameters::ECHO_CANCELLER when an
input stream is created and sets a boolean if it was enabled.

Applies an experimental System AEC mode on Windows 24H2 and above if
AudioParameters::ECHO_CANCELLER was set.

As a result: it is now possible to enable a flag and thereby activate a
system AEC on Windows 24H2 and above.

The CL also adds support for the EnforceSystemEchoCancellation flag in
chrome://flags for Mac AND Windows:

The new UI flag looks like this:
https://screenshot.googleplex.com/7Y5YkJwA7TN6jy5

Support for the command-line flag has already landed in
https://chromium-review.googlesource.com/c/chromium/src/+/5953258

Bug: 393098901
Bug: 375523826
Change-Id: I4faa8ada4c2f714323c952be2626702ea6d3e137
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6218470
Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Henrik Andreasson <henrika@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1414567}