[FEATURE] Contribution - Support for ML resources - ML Connector, ML Model Group, ML Model

[rafamlr]

Is your feature request related to a problem?

There is no support for ML Commons API resources, like ML Connectors, ML Model Groups, or ML Models.

What solution would you like?

Support for those resources in this Terraform provider. I opened a PR - #280

What alternatives have you considered?

I'm working in a team that needs to provision resources inside our OpenSearch clusters, and we have a IaC Terraform repository to do it, which uses this Provider to provision some resources. However, it lacks support for ML resources, so I started by using local-exec provisioners and null_resource resources to call the OpenSearch API directly.
Then, because that wasn't good enough, I implemented a custom Provider (built-in our IaC Terraform repo).
Now I'm here because other developers might want to use these resources.

Do you have any additional context?

#280

[andrross]

Catch All Triage - 1