Add computation and visualization of kinetic energy spectrum and spectrograms

[hkjeldsberg]

• Added computation and visualization of kinetic energy, tuburlent kinetic energy, kinetic energy spectrum and spectrogram (currently u-component)
• Added support of plotting single probes separately

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.67568% with 45 lines in your changes missing coverage. Please review.

Project coverage is 68.51%. Comparing base (1b547b4) to head (4958e93).

Files with missing lines	Patch %	Lines
src/vampy/simulation/Womersley.py	0.00%	14 Missing :warning:
src/vampy/simulation/simulation_common.py	0.00%	12 Missing :warning:
src/vampy/simulation/Artery.py	82.35%	6 Missing :warning:
src/vampy/simulation/MovingAtrium.py	88.57%	4 Missing :warning:
src/vampy/simulation/__init__.py	0.00%	3 Missing :warning:
src/vampy/simulation/Atrium.py	92.59%	2 Missing :warning:
src/vampy/simulation/Probe.py	0.00%	2 Missing :warning:
tests/test_visualize_probes.py	92.30%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #115      +/-   ##
==========================================
+ Coverage   67.68%   68.51%   +0.83%     
==========================================
  Files          14       14              
  Lines        1176     1188      +12     
==========================================
+ Hits          796      814      +18     
+ Misses        380      374       -6     

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