Refactor project directories

[sebsto]

This PR refactors the project's directories.
As the number of source files grows, I created subdirectories to separate the runtime itself, from its HTTP Client (RuntimeClient) and local HTTP Server (Lambda+LocalServer).

The new layout looks like this:

Sources
├── AWSLambdaRuntime
│   ├── FoundationSupport
│   │   ├── Context+Foundation.swift
│   │   ├── Lambda+JSON.swift
│   │   └── Vendored
│   │       ├── ByteBuffer-foundation.swift
│   │       └── JSON+ByteBuffer.swift
│   ├── HTTPClient
│   │   ├── ControlPlaneRequest.swift
│   │   ├── ControlPlaneRequestEncoder.swift
│   │   ├── LambdaRuntimeClient+ChannelHandler.swift
│   │   ├── LambdaRuntimeClient.swift
│   │   └── LambdaRuntimeClientProtocol.swift
│   ├── HTTPServer
│   │   ├── Lambda+LocalServer+Pool.swift
│   │   └── Lambda+LocalServer.swift
│   ├── Lambda.swift
│   ├── LambdaClock.swift
│   ├── LambdaContext.swift
│   ├── LambdaRequestID.swift
│   ├── LambdaResponseStreamWriter+Headers.swift
│   ├── LambdaRuntimeError.swift
│   ├── Runtime
│   │   ├── LambdaHandlers.swift
│   │   ├── LambdaRuntime+Codable.swift
│   │   ├── LambdaRuntime+Handler.swift
│   │   ├── LambdaRuntime+ServiceLifecycle.swift
│   │   └── LambdaRuntime.swift
│   ├── SendableMetatype.swift
│   ├── Utils.swift
│   └── Version.swift
└── MockServer
    └── MockHTTPServer.swift

[Copilot]

Pull request overview

This PR reorganizes the project structure by moving source files into subdirectories as the codebase grows, improving maintainability and logical separation of concerns.

• Runtime core files moved to Runtime/ subdirectory
• HTTP client implementation moved to HTTPClient/ subdirectory
• Local server support moved to HTTPServer/ subdirectory

Reviewed changes

Copilot reviewed 2 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Sources/AWSLambdaRuntime/Runtime/LambdaRuntime.swift	Core runtime implementation moved to Runtime subdirectory
Sources/AWSLambdaRuntime/Runtime/LambdaRuntime+ServiceLifecycle.swift	ServiceLifecycle integration moved to Runtime subdirectory
Sources/AWSLambdaRuntime/Runtime/LambdaRuntime+Handler.swift	Handler initialization extensions extracted from LambdaHandlers.swift and moved to Runtime subdirectory
Sources/AWSLambdaRuntime/Runtime/LambdaRuntime+Codable.swift	Codable adapter implementations moved to Runtime subdirectory
Sources/AWSLambdaRuntime/Runtime/LambdaHandlers.swift	Handler protocol definitions remain, with LambdaRuntime extensions moved out; added Sendable conformance to StreamingClosureHandler
Sources/AWSLambdaRuntime/HTTPServer/Lambda+LocalServer.swift	Local server implementation for testing moved to HTTPServer subdirectory
Sources/AWSLambdaRuntime/HTTPServer/Lambda+LocalServer+Pool.swift	Pool data structure for local server moved to HTTPServer subdirectory
Sources/AWSLambdaRuntime/HTTPClient/LambdaRuntimeClientProtocol.swift	Runtime client protocol definitions moved to HTTPClient subdirectory
Sources/AWSLambdaRuntime/HTTPClient/LambdaRuntimeClient.swift	Runtime client implementation moved to HTTPClient subdirectory
Sources/AWSLambdaRuntime/HTTPClient/LambdaRuntimeClient+ChannelHandler.swift	Channel handler for runtime client moved to HTTPClient subdirectory
Sources/AWSLambdaRuntime/HTTPClient/ControlPlaneRequestEncoder.swift	Control plane request encoder moved to HTTPClient subdirectory
Sources/AWSLambdaRuntime/HTTPClient/ControlPlaneRequest.swift	Control plane request types and metadata moved to HTTPClient subdirectory

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