add debug flag for emitter to debug the generator

[ArcturusZhang]

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[m-nash]

Is this to be able to attach the debugger once it gets to the dotnet code in the generator? If so LGTM.

[ArcturusZhang]

Is this to be able to attach the debugger once it gets to the dotnet code in the generator? If so LGTM.

Yes, we already have the flag in the generator to enable it to attach, but we are not passing the flag into the generator from the emitter.
This PR makes sure that we could pass in the flag through the emitter

[lirenhe]

I believe this has no impact for the SDK repo, could you confirm?

[ArcturusZhang]

I believe this has no impact for the SDK repo, could you confirm?

definitely no change in SDK