adds TOML support for built-in loaders

[sarah11918]

Description (required)

Accompanies the new feature that adds TOML support to the file() and glob() loaders.

This PR:

• updates all lists of supported content collection entry file types to include TOML
• removes an example of writing a custom parser function to use TOML as a content collection entry

Considerations:

• There isn't really a great spot to mention that this is since v5.12? We could update lists to say e.g.:

Collections stored locally in your project or on your filesystem can have entries of Markdown, MDX, Markdoc, YAML, TOML (added in v5.12), or JSON files:

For Astro version: 5.12. See astro PR #13941.

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[aditsachde]

Thanks so much for making these updates, I think this looks good! Only note I have is that I updated the changeset in my PR to include a note about how the file() loader interacts with some quirks of the TOML format. I'm not sure if it's worth including in the docs – it seems intuitive enough to me, but I've also spent a lot of time staring at TOML, so I'm not a good judge there.