Add support for more than one event per function

[mansona]

In the documentation https://serverless.com/framework/docs/providers/google/guide/events/ it currently says:

Note: Currently only one event definition per function is supported.

I just got stung by this when trying to follow along with serverless/serverless#1909 just to find it doesn't actually work with gcloud 🙈 I missed the note when looking at the documentation originally.

Is there currently any plan to implement this? If you could let me know where to look at the code I might have some time to contribute 👍