Enable operational advertising (and CASE server) in Darwin framework. (#15951)
Enable operational advertising (and CASE server) in Darwin framework. (#15951)

Operational advertising and a CASE server is needed for at least two things:

1. Subscriptions, so the other side can establish a CASE session if
   there isn't one already.

2. OTA provider server implementation.

Chances are, things using the framework will want at leasts one of
these things, so we just enable unconditionally when bringing up the
Matter stack.
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