Added commands to enable/disable display via management API

[hgross]

Added a /display resource with GET, PUT, POST support to disable/enable the display via xset dpms force off/on.
Also added a .http file to easily make requests to the block via the REST client VSCode extension.

[github-actions]

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[github-actions]

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https://github.com/balena-io-experimental/browser/actions/runs/11628488255

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[github-actions]

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https://github.com/balena-io-experimental/browser/actions/runs/11759215924

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[github-actions]

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https://github.com/balena-io-experimental/browser/actions/runs/11759250368

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Things to look for: GitHub Actions Security Cheat Sheet