Add ReservoirSimulationRockPhysics content endpoints

Type of change

• Bug Fix
• Feature
• Documentation

Does this introduce a change in the core logic?

• [Yes]

Does this change the cloud provider implementation, and if so, which cloud?

• AWS
• Azure
• GCP
• IBM

Does this introduce a change that must be documented in the README.md file?

• [No]

Updates description?

Add Get Schema Post and Get content endpoints, closes issues #635 (closed), #637 (closed), #638 (closed)