Reinitialize if optimization fails

[sethaxen]

If for some reason we hit an edge case in the optimizer and an error is thrown, this PR causes Pathfinder to draw a new initialization point and rerun.

This PR makes a breaking changes: if an OptimizationProblem has been provided, its initialization point u0 must be mutable and may be overwritten. This avoids a deepcopy of the OptimizationProblem.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.15%. Comparing base (7bc83fb) to head (653cff8).
⚠️ Report is 90 commits behind head on main.

Files with missing lines	Patch %	Lines
src/singlepath.jl	84.61%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (7bc83fb) and HEAD (653cff8). Click for more details.

HEAD has 46 uploads less than BASE

Flag	BASE (7bc83fb)	HEAD (653cff8)
	50	4

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #130       +/-   ##
===========================================
- Coverage   92.65%   78.15%   -14.51%     
===========================================
  Files          13       13               
  Lines         572      563        -9     
===========================================
- Hits          530      440       -90     
- Misses         42      123       +81     

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