Revert "Revert "startDevWorker - Milestone 1 (#4497)" (#4531)" (#4535)

This reverts commit 310281a.

.changeset/serious-toys-repeat.md

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+---
+"wrangler": minor
+---
+
+Reintroduces some internal refactorings of wrangler dev servers (including `wrangler dev`, `wrangler dev --remote`, and `unstable_dev()`).
+
+These changes were released in 3.13.0 and reverted in 3.13.1 -- we believe the changes are now more stable and ready for release again.
+
+There are no changes required for developers to opt-in. Improvements include:
+
+- fewer 'address in use' errors upon reloads
+- upon config/source file changes, requests are buffered to guarantee the response is from the new version of the Worker

fixtures/dev-env/.gitignore

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+dist

fixtures/dev-env/package.json

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+{
+	"name": "dev-env",
+	"version": "1.0.1",
+	"private": true,
+	"description": "",
+	"license": "ISC",
+	"author": "",
+	"main": "src/index.js",
+	"scripts": {
+		"test": "npx vitest run",
+		"test:ci": "npx vitest run",
+		"test:watch": "npx vitest",
+		"type:tests": "tsc -p ./tests/tsconfig.json"
+	},
+	"devDependencies": {
+		"@types/ws": "^8.5.7",
+		"@cloudflare/workers-tsconfig": "workspace:^",
+		"get-port": "^7.0.0",
+		"miniflare": "3.20231025.1",
+		"undici": "^5.23.0",
+		"wrangler": "workspace:*",
+		"ws": "^8.14.2"
+	},
+	"dependencies": {}
+}