Use function protobufs from function-sdk-go

[adamwg]

Description of your changes

We use the function protobufs in the function we implement for injecting and extracting context during render. When this code lived in crossplane/crossplane it made sense to use the protobufs from there, but now that we're separate it would be better to use the versions in function-sdk-go like a normal function.

This removes our dependency on crossplane/crossplane, which is nice.

I have:

• Read and followed Crossplane's contribution process.
• Run ./nix.sh flake check to ensure this PR is ready for review.
  - [ ] Added or updated unit tests.
  - [ ] Linked a PR or a docs tracking issue to document this change.
  - [ ] Added backport release-x.y labels to auto-backport this PR.

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Reviewing files that changed from the base of the PR and between a336c13 and 2388f21.

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📒 Files selected for processing (6)

• cmd/crossplane/render/contextfn/context.go
• cmd/crossplane/render/contextfn/context_test.go
• cmd/crossplane/render/contextfn/listener.go
• cmd/crossplane/render/contextfn/listener_test.go
• cmd/crossplane/render/convert.go
• cmd/crossplane/render/render.go

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[haarchri]

any downsides ? negatives impacts around updating as soon as possible the sdks after crossplane updates ?

[adamwg]

any downsides ? negatives impacts around updating as soon as possible the sdks after crossplane updates ?

Only downside I can see is that we'll have to update function-sdk-go to pull in any new changes in Crossplane. Any changes should be backward compatible, though, so I don't expect we'll require the latest features quickly given our usage.