Extract Express v4 integration from @apollo/server

Based on `@as-integrations/hapi`, with some updates (like moving from
Circle to GH Actions).

Author: glasser

.changeset/config.json

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+{
+  "$schema": "https://unpkg.com/@changesets/config@1.6.3/schema.json",
+  "changelog": [
+    "@changesets/changelog-github",
+    { "repo": "apollo-server-integrations/apollo-server-integration-express4" }
+  ],
+  "commit": false,
+  "access": "public",
+  "baseBranch": "main"
+}

.config/mise/config.toml

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+# This is a config file for "mise-en-place": https://mise.jdx.dev/
+# It pins the version of Node and can be used to run other tools as well.
+# It's what we use to set up tools in CI.
+
+[tools]
+node = "22.13.0"
+
+[env]
+# Put binaries from npm-installed packages on PATH (eg `changeset`).
+_.path = ["{{config_root}}/node_modules/.bin"]

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [ 20, 22, 24 ]
+    name: Build and test with Node ${{ matrix.node }}
+    steps:
+    - uses: actions/checkout@v4
+    - uses: jdx/mise-action@v2
+      with:
+        mise_toml: |
+          [tools]
+          node = "${{ matrix.node }}"
+    - uses: actions/setup-node@v4
+      with:
+        cache: 'npm'
+    - run: npm ci
+    - run: npm test
+
+  prettier:
+    runs-on: ubuntu-latest
+    name: Prettier
+    steps:
+    - uses: actions/checkout@v4
+    - uses: jdx/mise-action@v2
+    - uses: actions/setup-node@v4
+      with:
+        cache: 'npm'
+    - run: npm ci
+    - run: npm run prettier-check
+
+  lint:
+    runs-on: ubuntu-latest
+    name: Lint
+    steps:
+    - uses: actions/checkout@v4
+    - uses: jdx/mise-action@v2
+    - uses: actions/setup-node@v4
+      with:
+        cache: 'npm'
+    - run: npm ci
+    - run: npm run lint
+
+  spell-check:
+    runs-on: ubuntu-latest
+    name: Spell Check
+    steps:
+    - uses: actions/checkout@v4
+    - uses: jdx/mise-action@v2
+    - uses: actions/setup-node@v4
+      with:
+        cache: 'npm'
+    - run: npm ci
+    - run: npm run spell-check

.github/workflows/release-pr.yml

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+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v4
+        with:
+          # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
+          fetch-depth: 0
+
+      - name: Install Node with Mise
+        uses: jdx/mise-action@v2
+
+      - name: Setup Node.js 16.x
+        uses: actions/setup-node@v4
+        with:
+          cache: 'npm'
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Create Release Pull Request / NPM Publish
+        uses: changesets/action@v1
+        with:
+          publish: npm run publish-changeset
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

.gitignore

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+# Ignore the compiled output.
+dist/
+
+# TypeScript incremental compilation cache
+*.tsbuildinfo
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Coverage (from Jest)
+coverage/
+
+# JUnit Reports (used mainly in CircleCI)
+reports/
+junit.xml
+
+# Node modules
+node_modules/
+
+# Mac OS
+.DS_Store
+
+.vscode

.npmignore

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+*
+!src/**/*
+src/**/__tests__/**
+!dist/**/*
+dist/**/__tests__/**
+!package.json
+!README.md
+!tsconfig.base.json
+!tsconfig.json
+!tsconfig.build.json

.npmrc

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+engine-strict=true

.prettierignore

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+*.json
+*.json5
+*.yml
+*.md
+
+dist/
+
+.volta

.prettierrc

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+{
+  "trailingComma": "all",
+  "singleQuote": true
+}

CHANGELOG.md

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+# @as-integrations/express4
+