Kick off the SDK based on Symfony's MCP SDK

.github/CODEOWNERS

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+* @chr-hertel @Nyholm @CodeWithKyrian

.github/workflows/pipeline.yml

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+name: pipeline
+on: pull_request
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: ['8.1', '8.2', '8.3', '8.4']
+        dependencies: ['lowest', 'highest']
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: "none"
+
+      - name: Install Composer
+        uses: "ramsey/composer-install@v3"
+        with:
+          dependency-versions: "${{ matrix.dependencies }}"
+
+      - name: Composer Validation
+        run: composer validate --strict
+
+      - name: Install PHP Dependencies
+        run: composer install --no-scripts
+
+      - name: Tests
+        run: vendor/bin/phpunit
+
+  qa:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.1'
+          coverage: "none"
+
+      - name: Install Composer
+        uses: "ramsey/composer-install@v3"
+
+      - name: Composer Validation
+        run: composer validate --strict
+
+      - name: Install PHP Dependencies
+        run: composer install --no-scripts
+
+      - name: Code Style PHP
+        run: vendor/bin/php-cs-fixer fix --dry-run
+
+      - name: PHPStan
+        run: vendor/bin/phpstan analyse