feat(react-router-express): support non-express servers

[43081j]

We don't actually use any express specific functionality, so can change our handlers to accept the lower level interfaces instead (IncomingMessage and ServerResponse).

This means servers like polka can also use the react-router-express middleware.

[changeset-bot]

🦋 Changeset detected

Latest commit: 676a8c4

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

This PR includes changesets to release 11 packages

Name	Type
@react-router/express	Major
@react-router/serve	Major
@react-router/dev	Major
@react-router/fs-routes	Major
@react-router/remix-routes-option-adapter	Major
create-react-router	Major
react-router	Major
react-router-dom	Major
@react-router/architect	Major
@react-router/cloudflare	Major
@react-router/node	Major

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[MichaelDeBoey]

I'm going to refer to @brophdawg11's remix-run/remix#7086 (comment)

Remix doesn't depend on Express - Remix runs on the Web Fetch API - this is just an adapter for Express to convert Express requests into Fetch Requests that can be handled by Remix. So it doesn't make sense to remove the express dependency.

Since express is already listed in peerDependencies, I think @TrySound's concern (see remix-run/remix#7086 (comment)) about making the Express adapter smaller is kinda obsolete now?

Since @react-router/dev also isn't using express anymore (@remix-run/dev was), a resubmission of @TrySound's remix-run/remix#7087 also doesn't seem necessary to me.
Unless I'm missing something?

[43081j]

Forgetting install size for a moment - this change means we can use the middleware in any express-like server.

Currently, it can be used with express but not much else. As mentioned in those comments, we could just make an adapter per web server. or we could just make this adapter work in all of them (this change).

Like most express middleware, it is still built for express but can be used in other servers with a compatible API then too