Use multiple forward diff trials to generate approximate Jacobian sparsity pattern

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.24% :tada:

Comparison is base (1eb7252) 87.42% compared to head (1f88ad1) 87.67%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #260 +/- ## ========================================== + Coverage 87.42% 87.67% +0.24% ========================================== Files 21 21 Lines 1201 1225 +24 ========================================== + Hits 1050 1074 +24 Misses 151 151 ``` | [Files Changed](https://app.codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/260?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff) | Coverage Δ | | |---|---|---| | [src/SparseDiffTools.jl](https://app.codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/260?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL1NwYXJzZURpZmZUb29scy5qbA==) | `100.00% <ø> (ø)` | | | [src/highlevel/coloring.jl](https://app.codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/260?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2hpZ2hsZXZlbC9jb2xvcmluZy5qbA==) | `100.00% <100.00%> (ø)` | | | [src/highlevel/common.jl](https://app.codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/260?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2hpZ2hsZXZlbC9jb21tb24uamw=) | `88.23% <100.00%> (+0.73%)` | :arrow_up: |

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