chore: Enforce type imports

[sidharthv96]

📑 Summary

Adds eslint rule for type imports.
Rest of the changes are from lint:fix.

📏 Design Decisions

This will avoid circular dependency when importing only types.

📋 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

[codecov]

Codecov Report

Merging #4763 (11b599d) into develop (6e0f411) will increase coverage by 29.30%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #4763       +/-   ##
============================================
+ Coverage    45.55%   74.85%   +29.30%     
============================================
  Files           53      146       +93     
  Lines         6621    14553     +7932     
  Branches        32      590      +558     
============================================
+ Hits          3016    10894     +7878     
+ Misses        3604     3547       -57     
- Partials         1      112      +111     

Flag	Coverage Δ
e2e	80.86% <ø> (?)
unit	45.55% <100.00%> (ø)

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

Files Changed	Coverage Δ
packages/mermaid/src/diagrams/c4/c4Diagram.ts	100.00% <ø> (ø)
packages/mermaid/src/diagrams/class/classDb.ts	82.35% <ø> (ø)
...ages/mermaid/src/diagrams/class/classDiagram-v2.ts	60.00% <ø> (ø)
...ges/mermaid/src/diagrams/class/classRenderer-v2.ts	69.40% <ø> (ø)
...s/mermaid/src/diagrams/flowchart/flowDiagram-v2.ts	75.00% <ø> (ø)
...ackages/mermaid/src/diagrams/gantt/ganttDiagram.ts	100.00% <ø> (ø)
...ckages/mermaid/src/diagrams/git/gitGraphDiagram.ts	100.00% <ø> (ø)
packages/mermaid/src/diagrams/pie/pieRenderer.ts	98.18% <ø> (ø)
...aid/src/diagrams/quadrant-chart/quadrantDiagram.ts	100.00% <ø> (ø)
...id/src/diagrams/quadrant-chart/quadrantRenderer.ts	91.30% <ø> (ø)
... and 15 more

... and 117 files with indirect coverage changes