feat: globally configure the internal link component

[angeloashmore]

Resolves: N/A

Description

[!IMPORTANT] This is an internal change. Do not use this feature directly in your website.

This PR allows for globally configuring the internal link component rendered by <PrismicLink> and <PrismicRichText>.

The default behavior does not change when using @prismicio/react directly; links will continue to render <a> by default.

This feature is intended for external packages to set default internal links. For example, @prismicio/next can set the default internal link to next/link.

Checklist

• [ ] A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• [ ] If my changes require tests, I added them.
• [ ] If my changes affect backward compatibility, it has been discussed.
• [ ] If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

Somewhere in a module:

// The "@prismicio/react/config" key is important
globalThis[Symbol.for("@prismicio/react/config")] = {
	internalLinkComponent: (props) => (
		<a data-foo {...props} />
	),
};

The following components will now render internal links as <a data-foo {...props} />:

<PrismicLink field={...} />
<PrismicRichText field={...} />

How to QA [^1]

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