Add zeroconf discovery support

[pawlizio]

Add zeroconf discovery support for Velux KLF200 devices on the network.

[codecov-commenter]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (4ae18e3) 80.00% compared to head (e4e12be) 79.31%.

Files	Patch %	Lines
pyvlx/discovery.py	31.37%	35 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #369      +/-   ##
==========================================
- Coverage   80.00%   79.31%   -0.69%     
==========================================
  Files          77       78       +1     
  Lines        3560     3612      +52     
==========================================
+ Hits         2848     2865      +17     
- Misses        712      747      +35     

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[Julius2342]

^^

[Julius2342]

Shouldnt we integrate this discovery in the pyvlx module itself?

something like: pyvlx = PyVLX(zeroconf=True, loop=loop)

[pawlizio]

I'm not sure, don't we need a separate pyvlx instances for every KLF200 which we find on the network or are we able to manage them inside one pyvlx instance? My idea for this PR was just to use it on HA side when someone start a manual configuration flow for VELUX in the UI, so that we can use zeroconf to check the network and create a list of identified KLF200 devices on the network. Those flows are used before an instance of pyvlx is created.
Basically HA supports natively a zeroconf flow step as well. I already considered this in my HA core PR 106660 here.