feat: AIChatMessage add ability for clients to add advanced components in messages [PIC-847]

[Sean Fitzpatrick (seanf-ctfl)]

Purpose of PR

In this PR, I update the AIChatMessage component with:

1. Advanced links

This component will render both Markdown & HTML. Clients can use HTML links to allow their agent to create links that:

• Opens pages in a new tab with target="_blank"
• This change also enables client-side links. Clients can use ComponentsPropOverrides to override the onClick behaviour and inject client-side navigation functionality.

2. Customised components

This PR also allows clients to customise how message components are rendered. (e.g. this story shows how a client can add icons to external links)

3. Fully custom components

This PR also shows how clients can include their own fully custom components in the AIChatMessage.
(e.g. This story shows how clients can do this. Clients can provide a custom render for divs with a specific data tag )

PR Checklist

• I have read the relevant readme.md file(s)
• All commits follow our Git commit message convention
• Tests are added/updated/not required
• Tests are passing
• Storybook stories are added/updated/not required
• Usage notes are added/updated/not required
• Has been tested based on Contentful's browser support
• Doesn't contain any sensitive information

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Latest commit: 18f6248

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[Moe Shaaban (mshaaban0)]

Looking Good 👍🏼