feat(v7): stabilize route caching

[ArmandPhilippot]

Description (required)

Updates docs to stabilize route caching. Kinda supersedes #13944

• Cherry-picks changes made in Update v7 upgrade guide changes #13944 to the v7 upgrade guide
• Moves experimental-flags/route-caching contents to references/cache-provider.mdx (new), references/api-reference.mdx, guides/content-collections.mdx, and guides/caching.mdx (new)
• Updates the sidebar to remove/add pages
• Updates references/modules/astro-config to include memoryCache()
• Adds a redirection

Most of the content comes from experimental-flags/route-caching. But I have tweaked/reworded some parts for better integration (ie. a more guide/reference style).

Why a new guides/caching.mdx page vs a new section in guides/routing.mdx:

• Route caching as a guide had a lot of content, this seemed a bit unbalanced in guides/routing.mdx
• Route caching requires on-demand rendering and features requiring an adapter are listed under "Server rendering"

Happy to discuss about the new routes if we think something else might be better!

It seems there is no associated PR yet for route caching stabilization and this is still experimental on next (https://github.com/withastro/astro/blob/6a90f94acd451dfe6d9f3bcec764c20e6fe2808e/packages/astro/src/types/public/config.ts#L2973-L3050) so we'll need to wait before merging this to v7 docs.

Related issues & labels (optional)

• Suggested label: 7.0

For Astro version: 7.0. See astro PR ....

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Tracked Files

File	Note
en/guides/caching.mdx	Localization added, will be marked as complete.
en/guides/content-collections.mdx	Source changed, localizations will be marked as outdated.
en/guides/upgrade-to/v7.mdx	Localization changed, will be marked as complete.
en/reference/api-reference.mdx	Source changed, localizations will be marked as outdated.
en/reference/cache-provider-reference.mdx	Localization added, will be marked as complete.
en/reference/content-loader-reference.mdx	Source changed, localizations will be marked as outdated.
en/reference/experimental-flags/advanced-routing.mdx	Source changed, localizations will be marked as outdated.
en/reference/experimental-flags/route-caching.mdx	Localization removed, will be marked as missing.
en/reference/modules/astro-config.mdx	Source changed, localizations will be marked as outdated.
en/reference/modules/astro-content.mdx	Source changed, localizations will be marked as outdated.
fr/reference/content-loader-reference.mdx	Localization changed, will be marked as complete.
fr/reference/experimental-flags/advanced-routing.mdx	Localization changed, will be marked as complete.
fr/reference/modules/astro-content.mdx	Localization changed, will be marked as complete.
ko/reference/content-loader-reference.mdx	Localization changed, will be marked as complete.
ko/reference/experimental-flags/advanced-routing.mdx	Localization changed, will be marked as complete.
ko/reference/modules/astro-content.mdx	Localization changed, will be marked as complete.
zh-cn/reference/content-loader-reference.mdx	Localization changed, will be marked as complete.
zh-cn/reference/modules/astro-content.mdx	Localization changed, will be marked as complete.

Warnings reference

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.