Shorter printing of default detectors

[adrhill]

Closes #189 with copy-pasteable outputs:

julia> TracerSparsityDetector()
TracerSparsityDetector()


julia> TracerSparsityDetector(gradient_tracer_type=SparseConnectivityTracer.GradientTracer{SparseConnectivityTracer.IndexSetGradientPattern{Int,Set{Int}}})
TracerSparsityDetector{SparseConnectivityTracer.GradientTracer{SparseConnectivityTracer.IndexSetGradientPattern{Int64, Set{Int64}}},SparseConnectivityTracer.HessianTracer{SparseConnectivityTracer.DictHessianPattern{Int64, BitSet, Dict{Int64, BitSet}, SparseConnectivityTracer.NotShared}}}()


julia> # Output can be copied and pasted:

julia> TracerSparsityDetector{SparseConnectivityTracer.GradientTracer{SparseConnectivityTracer.IndexSetGradientPattern{Int64, Set{Int64}}},SparseConnectivityTracer.HessianTracer{SparseConnectivityTracer.DictHessianPattern{Int64, BitSet, Dict{Int64, BitSet}, SparseConnectivityTracer.NotShared}}}()
TracerSparsityDetector{SparseConnectivityTracer.GradientTracer{SparseConnectivityTracer.IndexSetGradientPattern{Int64, Set{Int64}}},SparseConnectivityTracer.HessianTracer{SparseConnectivityTracer.DictHessianPattern{Int64, BitSet, Dict{Int64, BitSet}, SparseConnectivityTracer.NotShared}}}()

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Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.90%. Comparing base (45be93b) to head (da4016a).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/adtypes_interface.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   90.88%   91.90%   +1.01%     
==========================================
  Files          48       48              
  Lines        2106     2087      -19     
==========================================
+ Hits         1914     1918       +4     
+ Misses        192      169      -23     

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[adrhill]

I removed the Base.show utilities on internals, since they were never used.
To succinctly print tracer contents for debugging purposes, simply call gradient or hessian on tracers. This will print the underlying data structures.