Use znjson instead of znframe

[PythonFZ]

This PR replace the use of the znframe package with a definition on how to convert / read ase.Atoms from json strings through the use of znjson.

• Bond calculation through vis is now optional by setting vis.bonds_calculator=None.
• radii are now a rescaled version of covalent_radii from ase

Old ideas

Thereby I also looked into making computing the bonds optional.
Bonds computation can be expensive, thus loading the trajectory and visualizing it first and adding the bonds afterwards would be my prioritized way of doing things. We could use two celery workers for this:

1. start read
2. whilst still reading already process what is in the db. (on rare occasions this could be faster than 1. thus we need 3)
3. After reading has finished, run another worker to check if all bonds have been computed.

Where do we want to define if bonds should be computed? E.b. ZnDraw(bonds=True)? Via the CLI?

Further this PR now uses covalent_radii from ase. VdW are too large, even covalent look a bit weird compared to what we had before.

• test types after znjson.loads
• test inf data file reading

[PythonFZ]

Radii for np.nan values

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.71875% with 17 lines in your changes missing coverage. Please review.

Project coverage is 52.89%. Comparing base (acdf27d) to head (dd6fdb4).

Files	Patch %	Lines
zndraw/zndraw.py	72.22%	5 Missing ⚠️
zndraw/modify/__init__.py	0.00%	4 Missing ⚠️
zndraw/tasks/__init__.py	42.85%	4 Missing ⚠️
zndraw/utils.py	96.82%	2 Missing ⚠️
zndraw/base.py	66.66%	1 Missing ⚠️
zndraw/scene.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #481      +/-   ##
==========================================
+ Coverage   49.45%   52.89%   +3.44%     
==========================================
  Files          26       28       +2     
  Lines        2010     2142     +132     
==========================================
+ Hits          994     1133     +139     
+ Misses       1016     1009       -7     

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[RokasEl]

I think use_bonds should be a flag in the CLI. Having control via python would also be nice.