Add devcontainer for easier development

[theunrepentantgeek]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Adds a devcontainer to make it easier to have standardized tools at hand when working on this project.

The devcontainer file can be customized in downstream forks to add additional tools required by specific maintainers.

Does this PR introduce a user-facing change?

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: theunrepentantgeek / name: Bevan Arps (0d974cf, 762e0c7, 7ea05de, 84b38ad, 9ecf172, d1cc5ab)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: theunrepentantgeek
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[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @theunrepentantgeek. Thanks for your PR.

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