Add height property to the Gaussian2D component

[magnunor]

Progress of the PR

• Added height property
• update docstring
• add entry to CHANGES.rst
• add test
• ready for review

Example

import hyperspy.api as hs
g = hs.model.components2D.Gaussian2D()
print(g.height) # 0.15915494309189535
g.A.value = 100
print(g.height) # 15.915494309189533
g.sigma_x.value = 2
print(g.height) # 7.957747154594767

[codecov]

Codecov Report

Merging #2688 (b82298b) into RELEASE_next_minor (edd3b4b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@                 Coverage Diff                 @@
##           RELEASE_next_minor    #2688   +/-   ##
===================================================
  Coverage               77.14%   77.15%           
===================================================
  Files                     202      202           
  Lines                   30226    30230    +4     
  Branches                 6607     6607           
===================================================
+ Hits                    23319    23323    +4     
  Misses                   5117     5117           
  Partials                 1790     1790           

Impacted Files	Coverage Δ
hyperspy/_components/gaussian2d.py	100.00% <100.00%> (ø)

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[magnunor]

All done!