Add JacobianTracer

[adrhill]

Closes #19.

Breaking changes:

• renames Tracer to ConnectivityTracer
• renames connectivity(f, x) to pattern(f, T, x), where T is a tracer type
• renames connectivity(f!, y, x) to pattern(f!, y, T, x), where T is a tracer type
• trace_input(x) has been replaced by trace_input(T, x), where T is a tracer type

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 61.53846% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 63.41%. Comparing base (3830ca0) to head (b2a7c63).

Files	Patch %	Lines
src/overload_jacobian.jl	24.00%	19 Missing ⚠️
src/conversion.jl	41.17%	10 Missing ⚠️
src/tracers.jl	70.37%	8 Missing ⚠️
src/overload_connectivity.jl	46.15%	7 Missing ⚠️
src/pattern.jl	96.96%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #22       +/-   ##
===========================================
- Coverage   80.24%   63.41%   -16.84%     
===========================================
  Files           6        7        +1     
  Lines          81      123       +42     
===========================================
+ Hits           65       78       +13     
- Misses         16       45       +29     

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