refactor: Support async parsers [internal]

[sidharthv96]

📑 Summary

We're adding support for async parsers, to enable code splitting the langium parsers.

📏 Design Decisions

The new Diagram.fromText function replaces the getDiagramFromText function internally. (Doesn't affect mermaidAPI.getDiagramFromText)
As the mermaid.parse function was already async, there's no major external changes.

📋 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 next branch

[netlify]

✅ Deploy Preview for mermaid-js ready!

Name	Link
🔨 Latest commit	442da6c
🔍 Latest deploy log	https://app.netlify.com/sites/mermaid-js/deploys/65b0cb93f57f14000862f43e
😎 Deploy Preview	https://deploy-preview-5233--mermaid-js.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b7c72cb) 44.38% compared to head (442da6c) 44.38%.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #5233   +/-   ##
=======================================
  Coverage   44.38%   44.38%           
=======================================
  Files          25       25           
  Lines        5227     5227           
  Branches       25       25           
=======================================
  Hits         2320     2320           
  Misses       2906     2906           
  Partials        1        1           

Flag	Coverage Δ
unit	44.38% <ø> (ø)

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