Enforce passing by keyword argument in QNode and qml.execute

[albi3ro]

Context:

Passing too many arguments positionally is error prone. It can be difficult to remember what the proper order of the arguements is, and it can be easy to reorder keyword arguments.

Description of the Change:

Start mandating that various keyword arguments are passed as keyword arguments in QNode and qml.execute

Benefits:

We forbid entire classes of mistakes.

Possible Drawbacks:

Related GitHub Issues:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.65%. Comparing base (2d074cc) to head (b0f778d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6610      +/-   ##
==========================================
- Coverage   99.65%   99.65%   -0.01%     
==========================================
  Files         455      455              
  Lines       42821    42820       -1     
==========================================
- Hits        42672    42671       -1     
  Misses        149      149              

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[andrijapau]

Looks good to me! Nice clean-up 🚀

[mudit2812]

I'm excited to find out how many tests will need to be updated 😅

[albi3ro]

I'm excited to find out how many tests will need to be updated 😅

exactly zero 😆