Maintainer Areas of Responsibility about opensearch-dashboards

[boktorbb]

I think that this topic was adequately covered in this issue over in the OpenSearch repo:

https://github.com/opensearch-project/OpenSearch/issues/537

On the dashboards side, we also haven't had the chance to particularly specialize into any roles and as alpha/beta releases keep moving forward we want to maintain an open process to allow for any available person to tackle what needs to be done at any given time.

We are currently working on a process that will help address some of the issues you bring up, such as PR escalation.