chore: Add ability to get classDefs from classDb

[yari-dewalt]

📑 Summary

Creates and exposes public function to fetch classDefs inside the classDb. Also includes change to properly split styles when inserting into its object styles array.

📏 Design Decisions

getClassDefs() returns the defined style classes from inside the classDb so we have access to them.

📋 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.
• 🦋 If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

[changeset-bot]

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Latest commit: b3b7539

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commit: b3b7539

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 4.47%. Comparing base (bc2cc61) to head (abd7ca2).

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/class/classDb.ts	0.00%	10 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6190   +/-   ##
=======================================
  Coverage     4.47%   4.47%           
=======================================
  Files          383     382    -1     
  Lines        54142   54138    -4     
  Branches       596     621   +25     
=======================================
  Hits          2425    2425           
+ Misses       51717   51713    -4     

Flag	Coverage Δ
unit	4.47% <0.00%> (+<0.01%)	⬆️

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

Files with missing lines	Coverage Δ
packages/mermaid/src/diagrams/class/classDb.ts	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

[yari-dewalt]

E2E tests failing as of right now due to argos but they should actually be good.

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[ashishjain0512]

See my comment