Generate 2-to-1 overloads on arbitrary types

[adrhill]

Previously, 2-to-1 overloads were hardcoded on Real numbers.
This PR generalizes this to arbitrary types, simplifying the code needed to avoid ambiguity errors.
This is also the first step towards a ForwardDiff extension addressing #196.

[adrhill]

JET.jl and DataInterpolations tests fail, but it looks unrelated to this PR.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 69.69697% with 10 lines in your changes missing coverage. Please review.

Project coverage is 91.05%. Comparing base (65a52ad) to head (92029d3).

Files with missing lines	Patch %	Lines
src/overloads/utils.jl	30.76%	9 Missing ⚠️
src/overloads/hessian_tracer.jl	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #197      +/-   ##
==========================================
+ Coverage   89.45%   91.05%   +1.60%     
==========================================
  Files          48       47       -1     
  Lines        2057     2080      +23     
==========================================
+ Hits         1840     1894      +54     
+ Misses        217      186      -31     

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