Refer to TracerSparsityDetector as detector instead of method

[adrhill]

This was previously inconsistent. detector is less ambiguous than method and matches ADTypes.jl's *Detector naming convention.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 96.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.90%. Comparing base (87f026a) to head (10822de).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
test/test_gradient.jl	66.66%	1 Missing ⚠️
test/test_hessian.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #191   +/-   ##
=======================================
  Coverage   91.90%   91.90%           
=======================================
  Files          48       48           
  Lines        2087     2087           
=======================================
  Hits         1918     1918           
  Misses        169      169           

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