Add parallelism to sequential fitting

[AndrewSazonov]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 74.35456% with 149 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.15%. Comparing base (883c384) to head (592a2c5).
⚠️ Report is 38 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/easydiffraction/analysis/sequential.py	69.67%	58 Missing and 26 partials ⚠️
src/easydiffraction/project/project.py	79.31%	13 Missing and 11 partials ⚠️
src/easydiffraction/display/plotting.py	4.76%	20 Missing ⚠️
src/easydiffraction/io/cif/serialize.py	85.88%	4 Missing and 8 partials ⚠️
src/easydiffraction/core/datablock.py	25.00%	3 Missing ⚠️
src/easydiffraction/analysis/analysis.py	85.71%	2 Missing ⚠️
...raction/analysis/categories/constraints/default.py	88.88%	1 Missing ⚠️
src/easydiffraction/core/variable.py	80.00%	0 Missing and 1 partial ⚠️
...easydiffraction/datablocks/experiment/item/base.py	0.00%	1 Missing ⚠️
.../easydiffraction/datablocks/structure/item/base.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #141      +/-   ##
===========================================
- Coverage    82.26%   82.15%   -0.11%     
===========================================
  Files           88      134      +46     
  Lines         5451     7357    +1906     
  Branches       454      686     +232     
===========================================
+ Hits          4484     6044    +1560     
- Misses         802     1073     +271     
- Partials       165      240      +75     

Flag	Coverage Δ
integration	69.56% <69.01%> (-0.39%)	⬇️
unittests	71.34% <30.80%> (-1.10%)	⬇️

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