[Return-types #5.3] Param-shift shot vector case

[antalszava]

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Description of the Change:

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[codecov[bot]]

Codecov Report

Merging #3099 (acebd44) into master (351c6bd) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3099   +/-   ##
=======================================
  Coverage   99.69%   99.69%           
=======================================
  Files         275      275           
  Lines       23944    24011   +67     
=======================================
+ Hits        23870    23937   +67     
  Misses         74       74           

Impacted Files	Coverage Δ
pennylane/gradients/finite_difference.py	100.00% <100.00%> (ø)
pennylane/gradients/parameter_shift.py	100.00% <100.00%> (ø)

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[timmysilv]

my above comments are all pretty small, this PR looks great! updating that test file was a true feat 😸

[antalszava]

@timmysilv @rmoyard thanks for the great comments! :tada:

I think I've addressed them all, some with questions - keen to get further thoughts. :+1: Let me know what should definitely change still in this PR.