Generic ZHA Zeroconf discovery

[puddly]

Proposed change

I'm introducing a new service type: _zigbee-gateway._tcp.local.. This will allow all future TCP coordinators to be supported without an explicit PR to ZHA. The only expected properties are radio_type (one of ezsp, znp, etc.) and serial_number (must be unique per device). The service name will be shown as-is.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
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• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @dmulcahey, @Adminiuga, @TheJulianJES, mind taking a look at this pull request as it has been labeled with an integration (zha) you are listed as a code owner for? Thanks!

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[puddly]

CC @tube0013