Add an example for ingesting CloudWatch logs into OpenSearch using OpenSearch Ingestion pipeline.

[sb2k16]

trafficstars

Fixes #1055

The purpose of this pull request is to provide an example on how OpenSearch Ingestion Pipeline could be used to ingest CloudWatch logs into Opensearch using a CloudWatch Lambda subscription filter.

This example creates the following resources:

• OpenSearch Serverless collection in a VPC where the logs would eventually be written to by the OpenSearch Ingestion Pipeline sink.
• OpenSearch Ingestion pipeline
• CloudWatch Subscription Filter with Lambda function to call the OSI pipeline endpoint to push logs data received from an incoming log stream.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.