Better naming of GRPC API

[mabdh]

Is your feature request related to a problem? Please describe.
There are some APIs that have Create... naming but it is actually doing Upsert in the repository layer. This could make user of API Confused. We need to make the naming consistent with behaviour.

Describe the solution you'd like
Rename all APIs that do upsert accordingly. Instead of calling it Create..., we call it Upsert...