Provide `StackId` in the ResourceHandlerRequest

[wbingli]

StackId is useful information for the resource to get context. Also some resources uses stackId to generate name with stack name.

Current workaround is using system tags. However, this information should be directly provided as public method in ResourceHandlerRequest to the handler.

[ranjdeep1]

Our resource uses stackId as well as stackGenerationId to generate its primary identifier. Please include stackGenerationId in ResourceHandlerRequest as well.

[ammokhov]

tracking #239 in here