gRPC gateway generated files IDE support

[Rustem Yusupov]

Hi dears!

Could you please help me with gRPC gateway?

I use https://rules-proto-grpc.com/en/latest/lang/grpc-gateway.html#gateway-grpc-library to generate gRPC gateway proto files and in general it works fine. But I have at least 2 issues there:

1. I can't import generated files (most likely because gazelle generates another go_proto_library.

2. IDE (Goland) can't recognise import path (I use rewrite in my root go.mod file) without having generated go files inside the workspace.

Here is my BUILD file for proto folder:

```

load("@io_bazel_rules_go//go:def.bzl", "go_library")
load("@io_bazel_rules_go//proto:def.bzl", "go_proto_library")
load("@golink//proto:proto.bzl", "go_proto_link")
load("@rules_proto//proto:defs.bzl", "proto_library")
load("@rules_proto_grpc//grpc-gateway:defs.bzl", "gateway_grpc_compile", "gateway_grpc_library")

gateway_grpc_library(
name = "recommendations_proto_gateway_library",
importpath = "ankorstore.io/proto/recommendations",
protos = [":recommendations_proto"],
)

proto_library(
name = "recommendations_proto",
srcs = ["recommendations.proto"],
visibility = ["//visibility:public"],
deps = ["@go_googleapis//google/api:annotations_proto"],
)

go_proto_library(
name = "recommendations_go_proto",
compilers = ["@io_bazel_rules_go//proto:go_grpc"],
importpath = "ankorstore.io/proto/recommendations",
proto = ":recommendations_proto",
visibility = ["//visibility:public"],
deps = ["@go_googleapis//google/api:annotations_go_proto"],
)

go_library(
name = "recommendations",
embed = [":recommendations_go_proto"],
importpath = "ankorstore.io/proto/recommendations",
visibility = ["//visibility:public"],
)

go_proto_link(
name = "recommendations_go_proto_link",
dep = ":recommendations_go_proto",
version = "v1",
)

```

N.B. go_proto_link was used to put generated proto file by @rules_proto inside the workspace but it doesn't work for gateway_grpc_library. 

Could you please someone to help me to figure it out as I'm very new in Bazel. Thank you very much in advance!

Best regards,

Rustem Yusupov