Add Custom Errors

[PythonFZ]

• Add two new Exceptions which will be raised when trying to access data, which is not available or if the graph does not exist.
  

  ZnTrack/zntrack/utils/exceptions.py

  Lines 13 to 24 in 73e8755

  	class DataNotAvailableError(asyncio.InvalidStateError):
  	"""Access Data that is not available
  	Trying to access e.g. zn.outs that are not computed yet will raise this error
  	"""
  	class GraphNotAvailableError(Exception):
  	"""DVC Graph is not written yet
  	Trying to access graph features such as zn.params or dvc.outs which are not available
  	"""

• Use dvc stage add followed by dvc repro instead of dvc run

• Update __repr__ to be more descriptive

• Add Tests and fix Test normal class behaviour #386

• Some smaller bugfix that came up when adding the errors.

[codecov]

Codecov Report

Merging #384 (73e8755) into main (9ae3161) will decrease coverage by 0.17%.
The diff coverage is 96.96%.

@@            Coverage Diff             @@
##             main     #384      +/-   ##
==========================================
- Coverage   96.74%   96.57%   -0.18%     
==========================================
  Files          34       34              
  Lines        1506     1546      +40     
  Branches      631      650      +19     
==========================================
+ Hits         1457     1493      +36     
- Misses         49       53       +4     

Flag	Coverage Δ
fulltest	96.18% <96.96%> (-0.17%)	⬇️
unittests	72.04% <57.81%> (-0.40%)	⬇️

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

Impacted Files	Coverage Δ
zntrack/zn/plots.py	100.00% <ø> (ø)
zntrack/core/dvcgraph.py	96.69% <90.90%> (-0.76%)	⬇️
zntrack/__init__.py	100.00% <100.00%> (ø)
zntrack/core/base.py	99.20% <100.00%> (+0.03%)	⬆️
zntrack/core/functions/decorator.py	96.96% <100.00%> (+0.06%)	⬆️
zntrack/core/zntrackoption.py	93.97% <100.00%> (-1.80%)	⬇️
zntrack/utils/config.py	100.00% <100.00%> (ø)
zntrack/utils/exceptions.py	100.00% <100.00%> (ø)
zntrack/utils/file_io.py	100.00% <100.00%> (ø)
zntrack/utils/utils.py	91.81% <100.00%> (ø)
... and 3 more

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