docs: 2.7 update

[PommeThibaudeau]

· php8 attributes instead of annotations.
· Removes item & collection operations
· ApiPlatform\Core\Annotation\ to ApiPlatform\Metadata
· forgotten file names

[dunglas]

I would remove the strict type declaration as it's not related with API Platform (the library works well with or without enabling this feature).

Maybe could we mention somewhere that it's supported, or add them only in the getting started guide to show this as a best practice, but "polluting" every snippet with this declaration isn't worth it IMHO.

[PommeThibaudeau]

I would remove the strict type declaration as it's not related with API Platform (the library works well with or without enabling this feature).

Maybe could we mention somewhere that it's supported, or add them only in the getting started guide to show this as a best practice, but "polluting" every snippet with this declaration isn't worth it IMHO.

I thought it would be nice to standardise these snippets but i could do the opposite, i.e. remove them all.