Write Ballerina observability guide for OpenSearch

[NipunaMadhushan]

Description

A guide to observe Ballerina programs with OpenSearch is required. OpenSearch is supported by Ballerina as a observability platform.

Version

No response

[NipunaMadhushan]

I have tried the guide in https://github.com/wso2/observability-resources with kubernetes and worked as expected. But the setup is not straight forward for a common user and the resources need for the setup is also large (12GB cluster). Therefore I am trying to use only docker images with minimal resources which helps a common user to observe Ballerina applications in Opensearch.