feat: AWS Lambda CDK deployment adapter

[aheissenberger]

This is a new simplified attempt to create an adapter for AWS Lambda #30
This version supports only CDK as the deployment option.

Features:

• streaming / buffered
• static file routing with Cloudfront Functions / simple Routing with Cloudfront behaviors

requires #281

[github-actions]

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Pull Request Overview

This PR adds comprehensive test coverage and integration tests for the AWS Lambda adapter, along with test fixtures and example applications demonstrating both streaming and buffered modes.

• Implements unit tests for adapter core components (ReactServerFramework, handlers, utilities)
• Adds integration tests with real fixture applications to validate end-to-end Lambda deployment
• Includes extensive debugging documentation and test infrastructure setup

Reviewed Changes

Copilot reviewed 51 out of 52 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
packages/react-server-adapter-aws-lambda/vitest.config.mjs	Vitest configuration for test runner and coverage reporting
packages/react-server-adapter-aws-lambda/test/setup.mjs	Global test setup with AWS Lambda runtime mocks
packages/react-server-adapter-aws-lambda/test/shared.test.mjs	Unit tests for shared adapter logic and ReactServerFramework
packages/react-server-adapter-aws-lambda/test/adapter.test.mjs	Tests for adapter configuration and handler path selection
packages/react-server-adapter-aws-lambda/test/utils.test.mjs	Tests for CDK utility functions (static asset routing)
packages/react-server-adapter-aws-lambda/test/streaming.test.mjs	Tests for streaming handler exports and initialization
packages/react-server-adapter-aws-lambda/test/streaming-timeout.integration.test.mjs	Integration tests validating Lambda timeout prevention via callbackWaitsForEmptyEventLoop
packages/react-server-adapter-aws-lambda/test/integration.test.mjs	Full integration tests building and executing handlers with real React Server apps
packages/react-server-adapter-aws-lambda/test/fixtures/minimal-app/*	Minimal React Server app fixture with streaming support for integration testing
packages/react-server-adapter-aws-lambda/test/fixtures/minimal-app-buffered/*	Minimal buffered-mode fixture for testing non-streaming Lambda handler
packages/react-server-adapter-aws-lambda/test/README.md	Comprehensive testing documentation with debug logging instructions
packages/react-server-adapter-aws-lambda/package.json	Package configuration with test scripts and dependencies
packages/react-server-adapter-aws-lambda/cdk/utils.mjs	Utility function for generating static asset routing tables
packages/react-server-adapter-aws-lambda/README.md	User-facing documentation for adapter features and configuration
examples/hello-world-aws-lambda/*	Full-featured example application demonstrating AWS Lambda deployment

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