grpc -> grpcjs + generated ts types from proto files

notes:
 * grpcjs doesnt like ByteBuffer, it has been replaced with the nodejs
   native Buffer
 * grpcjs doesnt like calls without an argument, add {} instead
   see src/grpc/subscribe.ts:24
 * grpcjs converts uint64 in a map key (map<uint64, ...>) to some hash,
   this is fixed with protobuf_long.patch which is automatically applied
   after running `npm install`
   this pr would fix the bug upstream protobufjs/protobuf.js#1669

.github/workflows/update_proto.yml

@@ -19,8 +19,14 @@ jobs:
         run: |
           find lnd/lnrpc -name '*.proto' -exec bash -c 'test -e proto/`basename {}` && cp {} proto' \;
           sed -i 's/^import.*\//import "/' proto/*
+          git add proto
+      - name: update generated types
+        run: |
+          bash grpc_gen_types.sh
+          git add src/grpc/types
+      - name: commit changes
+        run: |
           git config user.name 'Github Actions'
           git config user.email [email protected]
-          git add proto
-          git commit -m "Update proto files" || echo -n
+          git commit -m 'Update proto files and types' || echo -n
           git push