feature(@astrojs/cloudflare): port functionPerRoute

[alexanderniebuhr]

Changes

• it does keep support build.split, until it is fully removed
• ports fix: correctly handle prerender pages in split mode #7509 to next branch (since the bugfix was missing in next)
• ports feat: adapter features, deprecate astro configs #7839 to cloudflare adapter
• closes [astrojs/cloudflare] port build.split deprecation to cloudflare #7948

Testing

• see ported test

Docs

Since the changelog is copied from an already merged PR, I don't think we need to review it again

[changeset-bot]

🦋 Changeset detected

Latest commit: 17c27c8

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[natemoo-re]

LGTM, thanks so much for tackling this!

[ematipico]

I believe we have to update the README.md, and explain that functionPerRoute is only available when mode is "directory".

[alexanderniebuhr]

please review:

• changesets
• readme

/cc @withastro/maintainers-docs for feedback!

[sarah11918]

Hi @alexanderniebuhr ! Thanks for your patience as we're juggling both docs for the current branch that need to be published sooner and these docs for the next branch that won't go live until the end of the month! 😄

I've left a few suggestions (one of them has me shaking my fist at GitHub) for your consideration!

[yanthomasdev]

Thanks @alexanderniebuhr, this looks great! Added two small nit comments, after these are addressed LGTM.

[natemoo-re]

Thanks so much again @alexanderniebuhr!