Merge branch '8-use-buf-build-for-code-generation' into 'master'

Resolve "Use buf.build for code generation"

Closes #8

See merge request danet/api!19

buf.gen.yaml

+version: v1beta1
+plugins:
+  - name: go
+    out: go
+    opt:
+      - paths=source_relative
+  - name: go-grpc
+    out: go
+    opt:
+      - paths=source_relative
+  - name: js
+    out: web
+    opt:
+      - import_style=commonjs,binary
+  - name: grpc-web
+    out: web
+    opt:
+      - import_style=commonjs+dts,mode=grpcwebtext

buf.yaml

+version: v1beta1
+build:
+  roots:
+    - proto
+    - deps
+  excludes:
+    - deps/github.com/openconfig/gnmi/testing
+lint:
+  use:
+    - DEFAULT
+breaking:
+  use:
+    - FILE