Allow forming a network quickly, without writing keys and tables

[puddly]

Required by zigpy/zigpy#1183, as otherwise network formation takes an unacceptably long time.

[codecov-commenter]

Codecov Report

Patch coverage: 60.00% and project coverage change: -0.06 ⚠️

Comparison is base (9b959dc) 98.55% compared to head (e3a9e19) 98.50%.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #208      +/-   ##
==========================================
- Coverage   98.55%   98.50%   -0.06%     
==========================================
  Files          43       43              
  Lines        3803     3807       +4     
==========================================
+ Hits         3748     3750       +2     
- Misses         55       57       +2     

Impacted Files	Coverage Δ
zigpy_znp/api.py	96.51% <60.00%> (-0.44%)	⬇️

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