Feature/5114 add parallel commit config

[mathbraga]

📑 Summary

Adds support for parallel commits in git graphs.

Resolves #5114

📏 Design Decisions

The logic consists on searching for the closest parent commit of the current commit being positioned and placing it right after said parent, instead of the default that places after the latest commit.

parallelCommits: false

parallelCommits: true

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• 🔖 targeted develop branch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7b62466) 43.04% compared to head (1bad612) 79.63%.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #5161       +/-   ##
============================================
+ Coverage    43.04%   79.63%   +36.58%     
============================================
  Files           23      167      +144     
  Lines         5018    13893     +8875     
  Branches        21      707      +686     
============================================
+ Hits          2160    11063     +8903     
+ Misses        2857     2677      -180     
- Partials         1      153      +152     

Flag	Coverage Δ
e2e	85.50% <100.00%> (?)
unit	43.04% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...kages/mermaid/src/diagrams/git/gitGraphRenderer.js	98.30% <100.00%> (ø)

... and 162 files with indirect coverage changes

[nirname]

Great feature! Some minor changes are needed.

[mathbraga]

Made some of the changes you suggested. Please confirm if you still want me to change the logic with the if condition after reading the explanation at the comment above.

I fixed the issue from your example and added some e2e tests using it.

[sidharthv96]

Just a minor comment (optional).