Convert Vite plugin adapter API to presets

[markdalgleish]

This PR makes the following changes:

• Expands the adapter API into a more general presets API, supporting an array of preset objects that can define config to be merged with defaults before the user config is applied at the end.
• Removes the loadContext and viteConfig options from the old adapter API.
• Converts the Cloudflare adapter into a preset.
• Adds a remixConfigResolved hook to the preset which provides support for config validation after all presets have been applied.
• Adds a required name property to presets so that we can roll out improved error messaging support to the new remixConfigResolved hook in the future.
• Makes the buildEnd option available as a top-level option, not just for adapters.

Note that the documentation for preset authors is pretty light right now while this feature is still fresh. I'll add more docs as a follow-up, but the priority is to get this out for now.

[changeset-bot]

🦋 Changeset detected

Latest commit: 08ebfc2

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

This PR includes changesets to release 16 packages

Name	Type
@remix-run/dev	Patch
create-remix	Patch
remix	Patch
@remix-run/architect	Patch
@remix-run/cloudflare	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/css-bundle	Patch
@remix-run/deno	Patch
@remix-run/eslint-config	Patch
@remix-run/express	Patch
@remix-run/node	Patch
@remix-run/react	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/testing	Patch

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[pcattori]

I don't think we want to support merging presets. Presets should all be declared upfront. That could also simplify updateRemixPluginContext where omit is called for presets key.

[markdalgleish]

This code is currently not used since we never attempt to merge two configs that both have presets. Currently only user configs can have them. I only included it here for completeness in case this function ever ends up being public API.

[github-actions]

🤖 Hello there,

We just published version 2.6.0-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 2.6.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!