feat(server): Add device allowlist

[pajlada]

This PR is meant as a spiritual continuation of #55, implemented by using the evdev attributes instead of file paths. I'm doing the comparison inside Inspector to ensure we stop processing a device as soon as possible (i.e. before we create a writer for the device)

The default behaviour with device-allowlist unset is the same as before: All inputs found will be forwarded
If you configure the device-allowlist, only the devices matching at least 1 of the config options will be forwarded

Example configs

# Only forward Logitech devices

[[device-allowlist]]
vendor-id = 1133

# Forward Logitech & UHK V1 devices

[[device-allowlist]]
name = "Ultimate Gadget Laboratories UHK 60 v1"

[[device-allowlist]]
vendor-id = 1133

I currently support name, vendor-id, and product-id for filtering, and they're all either exact matches if they're set, or no check at all if they're unset.
Happy to change things as you see fit!

[htrefil]

Cool, thank you for this. I'll review soon.

[slartibart70]

nice to see some improvements in this project.
I tried your branch/pr and it works just great
For my part, this could easily be merged into main