chore(binding-netconf): use ts strict checking

[relu91]

Another down.

[codecov]

Codecov Report

Patch coverage: 43.90% and project coverage change: -0.09% ⚠️

Comparison is base (949a7e1) 75.28% compared to head (d70b130) 75.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1071      +/-   ##
==========================================
- Coverage   75.28%   75.20%   -0.09%     
==========================================
  Files          80       80              
  Lines       15455    15472      +17     
  Branches     1481     1484       +3     
==========================================
  Hits        11636    11636              
- Misses       3783     3800      +17     
  Partials       36       36              

Files Changed	Coverage Δ
...ckages/binding-netconf/src/codecs/netconf-codec.ts	19.68% <0.00%> (ø)
packages/binding-netconf/src/async-node-netconf.ts	54.85% <29.16%> (-4.64%)	⬇️
packages/binding-netconf/src/netconf-client.ts	65.38% <33.33%> (ø)
packages/binding-netconf/src/xpath2json.ts	63.05% <80.00%> (-0.24%)	⬇️
packages/binding-netconf/src/netconf.ts	94.87% <100.00%> (-5.13%)	⬇️

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