Update devcontainer.json schema with "hostRequirements"

[chrmarti]

"hostRequirements": {
  "cpus": 8,
  "memory": "16gb", // otherwise is bytes - allows for other units like mb, or k
  "storage": "32gb" // otherwise is bytes - allows for other units like tb, or mb, or k
}

[rzhao271]

@chrmarti I'm wondering how to verify this issue?
I added the following to my devcontainer.json, and rebuilt and reopened the workspace in a container, and the container opened as usual:

"hostRequirements": {
	"cpus": 100,
	"memory": "2kb",
	"storage": "1mb
}

[chrmarti]

@rzhao271 I should have mentioned: This is only implemented in Codespaces right now.

To verify make sure you get proposals for the new properties, their format (number or number with unit) is validated and there are no errors/warnings when using valid values.

[rzhao271]

@chrmarti I adjusted the values in Codespaces Web and rebuilt the container.
The values pass validation, but I'm not sure whether Codespaces handled the values properly.