Add support for Google Cloud Run serverless functions

[jameshbarton]

Version

No response

Is your feature request related to a problem? Please describe.

Both existing and future customers want to integrate with Google Cloud Run serverless functions, similar to what Gloo Edge does with AWS Lambda functions today.

Describe the solution you'd like

Support Google Cloud Run functions as a first-class integration within Gloo Edge.

Describe alternatives you've considered

No response

Additional Context

Internal: https://solo-io-corp.slack.com/archives/CRY9WRDGS/p1659122343877199