[FEATURE] Integrate license check plugin

[owaiskazi19]

Is your feature request related to a problem?

All the newly created files in the repo and the existing files should have OpenSearch contributor license.

What solution would you like?

Integrated the license check plugin present in OpenSearch to make sure the rule is applied during grade check

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.