Replace asyncio.wait_for with asyncio.timeout

[puddly]

See zigpy/zigpy#1187.

This has the side effect of making ezsp.Protocol.command an async function instead of a sync function returning a future.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (a1bcb88) 99.71% compared to head (962acc2) 99.71%.

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Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #546   +/-   ##
=======================================
  Coverage   99.71%   99.71%           
=======================================
  Files          61       61           
  Lines        4567     4581   +14     
=======================================
+ Hits         4554     4568   +14     
  Misses         13       13           

Impacted Files	Coverage Δ
bellows/ezsp/__init__.py	99.13% <100.00%> (+0.01%)	⬆️
bellows/ezsp/protocol.py	97.24% <100.00%> (+0.07%)	⬆️
bellows/uart.py	100.00% <100.00%> (ø)
bellows/zigbee/application.py	100.00% <100.00%> (ø)

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