WIP: Initial devcontainer

[faermanj]

Here's a working devcontainer configuration for github codespaces.

/kind support

What this PR does / why we need it:
Enables anyone to build and run this project on github codespaces and other tools supporting devcontainers

Fixes #5221

• squashed commits

Release note:
NONE

[k8s-ci-robot]

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: faermanj / name: Julio Faerman (aa51036)

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[k8s-ci-robot]

Hi @faermanj. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.