Add requestContext to staticHandler query/queryRoute

[brophdawg11]

Support a requestContext in the static handler similar to getLoadContext in Remix

Route loaders/actions accept a context for SSR uses only as of now:

let routes = [{
  path: '/',
  async loader({ request, params, context }) {
    let profile = await getUserProfile(context.user);
    return json({ profile });
  }
}

This is provided via the query/queryRoute methods on the server. Went with requestContext since it's request-specific on the server and because we already return a static handler "context" from query.

// entry-server.js
let requestContext = { user: getUser(req); }
let { query, queryRoute } = createStaticHandler(routes);
let context = query('/', { requestContext });
// or
let response = queryRoute('/', { routeId: 'root', requestContext });

Closes remix-run/remix#4733 (perf)

[changeset-bot]

🦋 Changeset detected

Latest commit: 7f26490

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

This PR includes changesets to release 5 packages

Name	Type
@remix-run/router	Patch
react-router	Patch
react-router-dom	Patch
react-router-dom-v5-compat	Patch
react-router-native	Patch

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