Avoid installing project specific binaries to system paths #153
Description
Currently we depend on 3 gRPC specific binaries: protoc-gen-go, protoc-gen-go-grpc and protoc.
We manage the version of protoc-gen-go and protoc-gen-go-grpc in the go.mod file. These binaries are installed if they doesn't already exist in the user's $PATH. If the user has a different version of this binary already installed, the version we specify in the go.mod will not be installed. This creates changes in the code generated from .proto files.
Line 12 in 39fbfd4
I think we can install these binaries within a sub-directory of the numaflow-go (e.g., bin/) using the Makefile. The implementation should be easy - the GOBIN can be used to make go install binaries to a custom directory, and the protoc is available as a static binary.