📑 Summary

This PR adds classLiteralName on the class diagram's language. This allows backticks on namespace label which seems reasonable to do.

I have also added a test case to not throw if backticks used on the namespace for class diagrams.

Now, this is valid syntax.

classDiagram
    namespace `A::B` {
        class `IPC::Sender`
    }
    RenderProcessHost --|> `IPC::Sender`

Outputs to:

Resolves #6815

📏 Design Decisions

This is a straightforward change to add classLiteralName in the language definition of namespace.

📋 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.
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