Update on the UVWindow and FTBeam modules

[adeliegorce]

PR including

• Various usage-induced fixes for the UVWindow and FTBeam modules,
• An option to define the Fourier transform of the beam (FTBeam object) from a Gaussian beam with the FTBeam.gaussian class method.
• Related tests

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@eefa537). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #357   +/-   ##
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  Coverage        ?   95.92%           
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  Files           ?       17           
  Lines           ?     6038           
  Branches        ?        0           
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  Hits            ?     5792           
  Misses          ?      246           
  Partials        ?        0           

Flag	Coverage Δ
unittests	95.92% <0.00%> (?)

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