Support parsing of node attributes in J2602 LDF file

[nuts4coffee]

Brief

• Allow parse of LDF files with "wakeup_time" and "poweron_time" node attributes.

Reference: J2602_3 Oct 2021:

Checklist

• Add relevant labels to the Pull Request
• Review test results and code coverage
  • Review snapshot test results for deviations
• Review code changes
  • Create relevant test scenarios
  • Update examples
  • Update JSON schema
• Update documentation
  • Update examples in README
• Update changelog
• Update version number

Resolves

• Describe the bug or feature and link to relevant issues

Evidence

• Analyze how the change might impact existing code

• Provide evidence that the feature is tested and covered properly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (63ae6cc) 96.28% compared to head (b5eb268) 96.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #130      +/-   ##
==========================================
+ Coverage   96.28%   96.30%   +0.02%     
==========================================
  Files          13       13              
  Lines        1453     1463      +10     
==========================================
+ Hits         1399     1409      +10     
  Misses         54       54              

Flag	Coverage Δ
3.10	96.30% <100.00%> (+0.02%)	⬆️
3.11	96.30% <100.00%> (+0.02%)	⬆️
3.12	96.30% <100.00%> (+0.02%)	⬆️
3.6	96.30% <100.00%> (+0.02%)	⬆️
3.7	96.30% <100.00%> (+0.02%)	⬆️
3.8	96.30% <100.00%> (+0.02%)	⬆️
3.9	96.30% <100.00%> (+0.02%)	⬆️

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[nuts4coffee]

@c4deszes Could you please help review this change? I notice some pipeline jobs have failed but I don't think they're related to my changes. Please let me know if there is anythng to fix on my end. Thanks.