[WIP] refactor: make sequence/svgDraw typesafe

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 360 lines in your changes are missing coverage. Please review.

Project coverage is 5.71%. Comparing base (3809732) to head (c5b3535).

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5484      +/-   ##
==========================================
- Coverage     5.72%   5.71%   -0.01%     
==========================================
  Files          278     277       -1     
  Lines        42013   42083      +70     
  Branches       490     515      +25     
==========================================
  Hits          2407    2407              
- Misses       39606   39676      +70     

Flag	Coverage Δ
unit	5.71% <0.00%> (-0.01%)	⬇️

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

Files	Coverage Δ
.../mermaid/src/diagrams/sequence/sequenceRenderer.ts	0.00% <0.00%> (ø)
...kages/mermaid/src/diagrams/common/svgDrawCommon.ts	0.00% <0.00%> (ø)
packages/mermaid/src/diagrams/sequence/svgDraw.ts	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes