feat: add update functions

[bdraco]

Tested systems

• R3.9.36 (a1a93f) 192.168.106.159 (89 nem)
• D3.17.3 (0e8c7a) 192.168.121.200 (81 nem)
• D5.0.62 (5e57a9) 192.168.111.40 (12 nem)
• D7.3.130 (91f206) 192.168.107.127 (89 nem plus) - not part of this PR

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.48% ⚠️

Comparison is base (cb0ed2a) 0.86% compared to head (905e2af) 0.39%.

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Additional details and impacted files

@@           Coverage Diff            @@
##            main     #16      +/-   ##
========================================
- Coverage   0.86%   0.39%   -0.48%     
========================================
  Files          7      13       +6     
  Lines        230     511     +281     
  Branches      44     111      +67     
========================================
  Hits           2       2              
- Misses       228     509     +281     

Files Changed	Coverage Δ
src/pyenphase/const.py	0.00% <0.00%> (ø)
src/pyenphase/envoy.py	0.00% <0.00%> (ø)
src/pyenphase/exceptions.py	0.00% <0.00%> (ø)
src/pyenphase/models/envoy.py	0.00% <0.00%> (ø)
src/pyenphase/models/inverter.py	0.00% <0.00%> (ø)
src/pyenphase/models/system_production.py	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[bdraco]

I can't test with the 7.x system because the wifi signal is too bad. I'll have to run ethernet to it but I'm out of outdoor ethernet so I'll have to run into town to get some and than pull a new line later today.

In the mean time, 3.x/5.x is all working

[bdraco]

Will fix the ci when I get back home