Use the Aqua workflow to test things further

[theogf]

This adds tests for the Aqua.jl workflow. It tests methods ambiguities, exported non-existing functions, lost parameters and more.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.88%. Comparing base (2a6e5e9) to head (e8c9702).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #436   +/-   ##
=======================================
  Coverage   90.88%   90.88%           
=======================================
  Files          52       52           
  Lines        1459     1459           
=======================================
  Hits         1326     1326           
  Misses        133      133           

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[theogf]

Well the type piracy is explicit in a comment:

KernelFunctions.jl/src/chainrules.jl

Line 3 in 2a6e5e9

# Note that this is type piracy as the derivative should be NaN for x == y.