Move ETW exporter from opentelelemetry-cpp to opentelemetry-cpp-contrib

[lalitb]

As per the specs only Zipkin, OTLP and Jaeger exporter belong to core repo. Rest of the exporters should be contributed to contrib repo.
Accordingly, ETW exporter should be moved to opentelemetry-cpp-contrib repo.

[marcalff]

This fix is blocking resolution of #1448

[lalitb]

As part of the movement, also need to remove TraceLoggingDynamics.h file which comes with different MIT license and Microsft Copyright, and use the OSS repo - https://github.com/microsoft/tracelogging - as submodule which brings this file.

[ThomsonTan]

With the above spec link, I don't see it mentioned explicitly that exporters other than OTLP, Zipkin.

One more thing to consider it moving ETW to contrib will need to update vcpkg to install opentelemtry-cpp[etw] in order to not to break the current installation flow.