[FEATURE] Ability to pass custom configuration to OpenSearch-Dashboards.yml file

[gaiksaya]

Is your feature request related to a problem?

We have the feature in add customized cluster settings by adding config to opensearch.yml #21
However, this feature is lacking for opensearch-dashboards

What solution would you like?

Ability to pass custom configuration to OpenSearch-Dashboards.yml file

What alternatives have you considered?

A clear and concise description of any alternative solutions or features you've considered.

Do you have any additional context?

Add any other context or screenshots about the feature request here.