Build examples with buf

_examples/README.md

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+## wsechoserver
+This example implements a websocket server using the proxy. The proto definition contains three RPCs:
+- `Echo` is a bidirectional stream that echoes back the client request.
+- `Stream` is a server-side stream that sends a fixed number of messages to the client and closes the connection
+- `Heartbeat` is a bidirectional stream that sends back messages to the client at intervals.
+
+## Usage
+Ideally, you should be able to run `go run _examples/cmd/wsechoserver` and start the example server.
+To build it locally, you'll need to install:
+- [buf](https://buf.build/)
+- [protoc-gen-go](google.golang.org/protobuf/cmd/protoc-gen-go)
+- [protoc-gen-go-grpc](google.golang.org/grpc/cmd/protoc-gen-go-grpc)
+- [protoc-gen-go-grpc-gateway](github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway)
+
+Generate the protobuf files by running:
+`buf generate -v .`
+
+You should now be able to start the server with the same run command above.

_examples/cmd/wsechoserver/echoserver/buf.gen.yaml

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+version: v1
+managed:
+  enabled: true
+  go_package_prefix:
+    default: github.com/tmc/grpc-websocket-proxy/examples/cmd/wsechoserver/echoserver
+    except:
+      - buf.build/googleapis/googleapis
+      - buf.build/grpc-ecosystem/grpc-gateway
+      - buf.build/percona/third_party
+
+plugins:
+  - name: go
+    path: protoc-gen-go
+    out: .
+    opt:
+      - paths=source_relative
+
+  - name: go-grpc
+    path: protoc-gen-go-grpc
+    out: .
+    opt:
+      - paths=source_relative
+
+  - name: grpc-gateway
+    path: protoc-gen-grpc-gateway
+    out: .
+    opt:
+      - paths=source_relative
+      - logtostderr=true

_examples/cmd/wsechoserver/echoserver/buf.lock

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+# Generated by buf. DO NOT EDIT.
+version: v1
+deps:
+  - remote: buf.build
+    owner: googleapis
+    repository: googleapis
+    commit: 2646de1347094058879360e68cb2ccc6

_examples/cmd/wsechoserver/echoserver/buf.yaml

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+version: v1
+deps:
+  - buf.build/googleapis/googleapis
+lint:
+  use:
+    - DEFAULT
+breaking:
+  use:
+    - FILE
+