CuDSS synchronize added

[sshin23]

Now we synchronize CUDABackend after factorize/solve with CUDSS. This fixes the timing inconsistency issue

[frapac]

LGTM! I just made a comment, but that's also something we can address in a separate PR.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.89%. Comparing base (cf6e6be) to head (b391cc2).
Report is 4 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
+ Coverage   69.80%   69.89%   +0.09%     
==========================================
  Files          39       40       +1     
  Lines        3888     3897       +9     
==========================================
+ Hits         2714     2724      +10     
+ Misses       1174     1173       -1     

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