Add mechanism to pass device attributes

[dharmjit]

This PR adds a mechanism to pass device attributes to emulate the real devices in local test setups.

• Add --device-attributes CLI flag and DEVICE_ATTRIBUTES env var
• Implement automatic type detection for int, bool, version, string values
• Add Helm template support for device attributes configuration

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[dharmjit]

Thanks @nojnhuh for taking a look at the PR, I have resolved your review comments in the subsequent commit. Thanks!