Add SparseDiffTools extension

[gdalle]

Fix #8

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 0.00%. Comparing base (8b11d31) to head (da56a66).

Files	Patch %	Lines
ext/SparseConnectivityTracerSparseDiffToolsExt.jl	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #9       +/-   ##
==========================================
- Coverage   66.29%   0.00%   -66.30%     
==========================================
  Files           5       5               
  Lines          89      96        +7     
==========================================
- Hits           59       0       -59     
- Misses         30      96       +66     

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