Use buf for proto generation (#286)

* Delete old generate code
* Add buf yaml files
* Update .proto files to use relative package paths
* Update proto generation docs
* Update example python plugin instructions
* Updated proto import path for example python plugin
* Update .gitignore rules
* Don't require embedded unimplemented structs
* Use BSR for all proto generation plugins
* buf generate

buf.gen.yaml

@@ -0,0 +1,14 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
+version: v1
+plugins:
+  - plugin: buf.build/protocolbuffers/go
+    out: .
+    opt:
+      - paths=source_relative
+  - plugin: buf.build/grpc/go:v1.3.0
+    out: .
+    opt:
+      - paths=source_relative
+      - require_unimplemented_servers=false

buf.yaml

@@ -0,0 +1,7 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
+version: v1
+build:
+  excludes:
+    - examples/

examples/bidirectional/README.md

@@ -41,8 +41,6 @@ If you update the protocol buffers file, you can regenerate the file
 using the following command from this directory. You do not need to run
 this if you're just trying the example.
 
-For Go:
-
 ```sh
-$ protoc -I proto/ proto/kv.proto --go_out=plugins=grpc:proto/
+$ buf generate
 ```

examples/bidirectional/buf.gen.yaml

@@ -0,0 +1,14 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
+version: v1
+plugins:
+  - plugin: buf.build/protocolbuffers/go
+    out: .
+    opt:
+      - paths=source_relative
+  - plugin: buf.build/grpc/go:v1.3.0
+    out: .
+    opt:
+      - paths=source_relative
+      - require_unimplemented_servers=false

examples/bidirectional/buf.yaml

@@ -0,0 +1,4 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
+version: v1