Rename Sobol sensitivity method

[NicolaCourtier]

Description

Add a check for finite bounds and specify the method by renaming sensitivity_analysis to get_sobol_sensitivities.

Fixes #657

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.86%. Comparing base (4628a65) to head (d6b76ca).
⚠️ Report is 49 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #938      +/-   ##
===========================================
+ Coverage    89.41%   92.86%   +3.44%     
===========================================
  Files           63       73      +10     
  Lines         4857     5690     +833     
===========================================
+ Hits          4343     5284     +941     
+ Misses         514      406     -108     

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[NicolaCourtier]

Alternatively, we can deprecate the function and move SALib into the optional dependencies, as SALib is only used directly in the examples. What do you think @Dibyendu-IITKGP ?

[agriyakhetarpal]

Suggested change

	if not np.isfinite(bounds_array).all():
	if np.any(~np.isfinite(bounds_array)):

nit: minor optimisation where we short-circuit as soon as it hits the first True