[Feature] Add support for passing --metadata-file from cli arg to buildx build #464

[Thacai]

This implements my feature request #464.

It took a bit more than just updating devContainersSpecCLI.ts, as the types seemingly had dependencies to each other (I'm no typescript expert, so mostly just copied how the rest of it were made).

Result is now we have an optional --metadata-file argument for devcontainer build, example: devcontainer build --metadata-file metadata.json --workspace-folder .

This enables outputting a json file as per https://docs.docker.com/engine/reference/commandline/buildx_build/#metadata-file, containing various information about the build process.

This file is used by third party tools, such as jfrog cli, which uses it to explicitly publish build info along side the image.

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[Thacai]

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