OpenAPI emitter: expose setOperationId function to set and modify operations in other emitters

[artsiommiksiuk]

Clear and concise description of the problem

I wanted to workaround this issue:

#8511

And figured that I can't that easily programmatically set operationId on an operation and pass modified program to openapi emitter.

I can't apply decorators from emitter (no js api for this).
And openapi emitter doesn't expose setOperationId function, only getOperationId.

So, I'd like to either have an openAPI exposed function to setOperationId on an operation, modifying the program.
Or have a way to programmatically set decorators using compiler API.

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