Avoid installing project specific binaries to system paths

[BulkBeing]

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.

https://github.com/numaproj/numaflow-go/blob/39fbfd46c0a08690840eb0d81fa45dd5dad31b18/go.mod#L12 https://github.com/numaproj/numaflow-go/blob/39fbfd46c0a08690840eb0d81fa45dd5dad31b18/pkg/apis/proto/map/v1/map_grpc.pb.go#L3

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.