feat: how about support grpc as protocol between server and client ？

[shalk]

Feature Request

Is your feature request related to a problem? Please describe:

gRPC have become very common and more ecosystem
How about support grpc as protocol between server and client ？
multiple language client maybe very easy to implement .

This is a very early discusstion

Describe the feature you'd like:

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

[acelyc111]

It's a big change, and it's hard to keep compatibility when upgrade the old versions.

[shalk]

It's a big change,

This proposal can be split into small feature or task.

and it's hard to keep compatibility when upgrade the old versions.

The compatibility will be keept to a major version like 3.0 to support both thrift and gRPC.
Next, version 4.0 remove thrift.

ref: https://www.alluxio.io/blog/moving-from-apache-thrift-to-grpc-a-perspective-from-alluxio