Lambda Annotations API Routing

### Describe the feature

With the release of the `[LambdaGlobalProperties]` attribute that can auto-generate the `static Main()` method for non managed and native AOT runtimes this functionality could be extended to provide API routing capabilities. The API annotations on methods could be used as part of a switch statement for the inbound API event.

### Use Case

Running a simple web API on Lambda without needing to introduce the overhead of ASP.NET. Removes the need to set the `ANNOTATIONS_HANDLER` environment variable when running multiple API endpoints in the same Lambda function.

Allows the use of an API Gateway `{proxy+}` route with all API request routing to the same Lambda function.

### Proposed Solution

The `GenerateMain` global properties attribute adds a switch statement based on an environment variable. Introduce a new `ApiRouting` Lambda Global Property that will generate the `static Main` method. Include a switch statement that uses a combination of the `HttpMethod` and `Path` from the incoming API event to route to the correct method.

Example of generated code:

```c#
public static async Task Main(string[] args)
{
Func> apiHandler = Handler;
await Amazon.Lambda.RuntimeSupport.LambdaBootstrapBuilder.Create(apiHandler, new Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer()).Build().RunAsync();
}

public async static Task Handler(APIGatewayProxyRequest request)
{
switch ($"{request.HttpMethod.ToUpper()} {request.Path.ToUpper()}")
{
case "GET /products":
return GetProductsHandler();
default:
return new APIGatewayProxyResponse()
{
StatusCode = 404
};
}
}

```

### Other Information

_No response_

### Acknowledgements

- [X] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS .NET SDK and/or Package version used

Amazon.Lambda.Annotations

### Targeted .NET Platform

.NET 6, .NET 8

### Operating System and version

All