GRPC Passthrough documentation and test server update

[sheidkamp]

Description

Update Auth passthrough docs:

• Update GRPC/HTTP passthrough docs to allow both examples to be run at the same time
• Call out GRPC body passthrough specifically

Update the GRPC/HTTP passthrough example servers to log the full requests received if the REQUEST_LOGGING env var is set and update to current version of go/dependencies

Update GRPC passthrough documentation to describe use of settings.extauth.requestBody

Code changes

Update the GRPC/HTTP passthrough example servers to log the full requests received if the REQUEST_LOGGING env var is set

API Changes

Update GRPC passthrough documentation to describe use of settings.extauth.requestBody

Docs changes

GRPC/HTTP passthrough examples updaetd

Context

Users asked for GRPC body passthrough, and an RFE was passed through the engineering team, but the functionality already existed. This functionality relies on settings.extauth.requestBody being set, and that was not documented in appropriate place.

Testing steps

validated by running through both HTTP and GRPC passthrough examples in the same cluster

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[solo-changelog-bot]

Issues linked to changelog:
https://github.com/solo-io/solo-projects/issues/7893

[sheidkamp]

Marking as "work in progress" to guarantee docs team review

[github-actions]

Visit the preview URL for this PR (updated for commit 0934e87):

https://gloo-edge--pr10676-passthrough-qol-zr0xigu8.web.app

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