Gracefully terminate dev server

[lpsinger]

Closes: #6871

• Docs
• Tests

Testing Strategy: trying it out on my own computer

This is not yet working because of ESM/CJS interop. When I try this out in an example Remix project, I get this error:

/Users/lpsinger/src/remix/build/node_modules/@remix-run/dev/dist/devServer/liveReload.js:15
var exitHook = require('exit-hook');
               ^

Error [ERR_REQUIRE_ESM]: require() of ES Module /Users/lpsinger/src/remix/node_modules/exit-hook/index.js from /Users/lpsinger/src/remix/build/node_modules/@remix-run/dev/dist/devServer/liveReload.js not supported.

[changeset-bot]

🦋 Changeset detected

Latest commit: 1b787a7

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

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