Update: [Lambda & ApiGateway Patterns] Enable X-Ray tracing

[hnishar]

Issue:

Enable X-Ray tracing for a Lambda function through tracing? construct props of lambda.Function for all the -lambda- patterns

Solution:

Update the DefaultLambdaFunctionProps in core to include tracing as lambda.Tracing.ACTIVE by default

Best practices documentation:

https://docs.aws.amazon.com/lambda/latest/dg/services-xray.html

[hnishar]

This update was pushed out in v1.61.0