refactor: entrypoint DX

[ematipico]

Changes

This refactors the code by improving the way the cloudflare adapter (and any adapter in the future) and retrieve the BaseApp module.

It creates a astro/app/entrypoint specifier that exposes the new function getApp. This function is responsible for returning an SSR-compatible app based on the dev parameter.

I took the opportunity to rename the virtual modules using the agreed naming convention, which is virtual:astro:<FEATURE>. I didn't rename the astro actions because it has already been done in another branch.

I also updated the cloudflare dependencies. I didn't update to the latest because some deps were released less than three days ago.

Testing

This refactor was done during TBD, and we all verified that it works.

Docs

N/A

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[florian-lefebvre]

I wonder if the entrypoint should be a virtual module instead, given it loads virtual modules. Wdyt? Eg. import { getApp } from 'astro:adapter'

[ematipico]

I rebased the code on top of next and I had to change some code around.

The specifier astro/assets/utils exported some code that used Node.js, so I had to break down the code and move the Node.js specific functions inside a new specifier astro/assets/node. I updated the downstream packages that were using those functions.

Please let me know if you have a better idea for how to export those functions (different specifiers, different names).