Params loading

[PythonFZ]

You can do Node.from_rev() and access parameters.
If they are not present in params.yaml they will default to None instead of raising an exception.

• Tests
• raise correct exception

[codecov]

Codecov Report

Merging #626 (270d0b9) into main (a266604) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #626   +/-   ##
=======================================
  Coverage   89.09%   89.09%           
=======================================
  Files          20       20           
  Lines        1467     1467           
  Branches      569      569           
=======================================
  Hits         1307     1307           
  Misses        160      160           

Flag	Coverage Δ
fulltest	89.09% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
zntrack/fields/zn/__init__.py	90.90% <100.00%> (ø)

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