Add EMF Exporter to Default Configuration

[sam-mosleh]

Is your feature request related to a problem? Please describe.
The current default configuration for the Lambda layer provides out-of-the-box support for tracing but not for metrics. Since the EMF exporter is already available and users often need a quick solution for telemetry, it would be very useful to include the EMF exporter in the default configuration. This will simplify the process for users by removing the need to add a configuration file only to support metrics. By default, outputting EMF logs to stdout would be enough. It’s frustrating that the current layer doesn’t support the awsemfexporter for metrics.

Describe the solution you'd like
I would like the default configuration to include the EMF exporter for metrics. This would allow users to have immediate access to CloudWatch metrics without additional setup. The configuration should output metrics to stdout by default, which simplifies the user experience.

Describe alternatives you've considered
Creating a new config file.

Additional context
I can create a PR for this change if needed, as the fix is fairly simple.

[msailes]

I think this would be a good addition.

[github-actions]

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