Gcp anthos (GONRG-3336)

Type of change

• Bug Fix
• Feature

Does this introduce a change in the core logic?

• [NO]

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Does this introduce a breaking change?

• [NO]

What is new behavior?

• Implemented Anthos module for GCP.
• MongoDB is as a datastore.
• Updated README.md.
• Created some basic Unit Tests.
• Created an initial GKE deploy config.