docs: How to configure GCP function identity

[ericrav]

This is an important configuration option for keeping Cloud Functions secure and should be documented.

serviceAccountEmail field in JSON schema: https://github.com/serverless/serverless-google-cloudfunctions/blob/master/provider/googleProvider.js#L141

GCP docs: https://cloud.google.com/functions/docs/securing/function-identity

[codecov[bot]]

Codecov Report

Base: 85.83% // Head: 85.83% // No change to project coverage :thumbsup:

Coverage data is based on head (ac33426) compared to base (f5b183a). Patch has no changes to coverable lines.

Additional details and impacted files

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  Coverage   85.83%   85.83%           
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  Files         314      314           
  Lines       13259    13259           
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  Hits        11381    11381           
  Misses       1878     1878           

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