[DX-598] Add a method signature component

[m-hulbert]

Description

This PR adds a component for styling method signatures in API references.

It can take an unwrapped string, as long as that string doesn't contain special characters such as < - in that case then you can wrap it as an expression in a template literal.

Everything is stripped and replaced as just a code wrapped string (``) for the raw markdown.

You can test on this temporary page: https://ably-docs-dx-598-method-vhhuoj.herokuapp.com/docs/chat/api/chat-client

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dx-598-method-signature

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