feat(state): add from, to ids for edge

[igorwessel]

📑 Summary

The ID of the from-to relationship was added to the diagram's edges.
Another denominator "_" was used to make the extraction of these respective IDs easier.

📏 Design Decisions

I am currently working on converting state diagram to Excalidraw, and I felt the need to have an easier way to find the edges.

I tried some alternative paths but without success, for example:

1. Manually tracking each edge, and using it as an index to search in .edgePaths, however, the index does not always reflect how we iterate through the parser.doc.
2. Using the respective graphCount id to get the edge, but in cases where we have multiple relationships for the same state, it may not find the correct edge because we do not have access to the graphCount in the parser.doc, only to the node id.

📋 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

Attention: Patch coverage is 4.54545% with 42 lines in your changes are missing coverage. Please review.

Project coverage is 5.73%. Comparing base (e68125e) to head (da150e8).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5503   +/-   ##
=======================================
  Coverage     5.73%   5.73%           
=======================================
  Files          277     277           
  Lines        41999   42033   +34     
  Branches       515     515           
=======================================
+ Hits          2407    2409    +2     
- Misses       39592   39624   +32     

Flag	Coverage Δ
unit	5.73% <4.54%> (+<0.01%)	⬆️

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

Files	Coverage Δ
...ges/mermaid/src/diagrams/class/classRenderer-v2.ts	0.00% <0.00%> (ø)
...ges/mermaid/src/diagrams/flowchart/flowRenderer.js	0.00% <0.00%> (ø)
.../mermaid/src/diagrams/flowchart/flowRenderer-v2.js	0.00% <0.00%> (ø)
...ges/mermaid/src/diagrams/state/stateRenderer-v2.js	0.00% <0.00%> (ø)
packages/mermaid/src/utils.ts	41.60% <12.50%> (-0.51%)	⬇️

[mermaid-bot]

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