GEP: GRPCRoute

[gnossen]

What would you like to be added:

A GRPCRoute resource for idiomatically routing gRPC traffic.

Why this is needed:

Full rationale detailed in the GEP.

[robscott]

/kind gep /remove-kind feature

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/lifecycle stale

[robscott]

/remove-lifecycle stale /lifecycle frozen

[robscott]

Reopening this issue to track adding the following:

• Conformance Tests
• Documentation

[robscott]

Removing this from v0.6.0 milestone since documentation has merged. Leaving open until conformance tests are in.

[shaneutt]

Created a specific issue for following up and creating conformance tests for GRPCRoute: https://github.com/kubernetes-sigs/gateway-api/issues/1795

[youngnick]

Hmm, there's been heaps of work that isn't linked here. I'll try and link everything back.