Not starting GRPC server

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# Description/Steps to reproduce
1. Scaffolded a LB 4 app as "loopback4-example-express-composition"
2. $ npm install --save @loopback/grpc
3. Modified Index.ts file with the code explained in the section "Component Configuration" of https://www.npmjs.com/package/@loopback/grpc
4. Followed the rest of the steps as mentioned in npm module "@loopback/grpc"

# Link to reproduction sandbox

# Expected result
1. Suppose to generate "greeter.proto.ts", but it never generate the .tc file for the proto file.
2. Copied the greeter.proto.ts file from "loopback4-extension-grpc/fixtures/greeter.proto.ts" to my above application.
3. When I run "$npm start", it does not throw any error but the command prompt returns and server is not listening to any specific port.

# Additional information
1. How can I make the client application to call this server?
2. How can I extend this to make grpc stream calls between client and server on loopback 4.

Start with the scaffolded app's Index.ts and the Component Configuration section of @loopback/grpc. Compare the setup with loopback4-extension-grpc/fixtures/greeter.proto.ts, then run npm start to reproduce the missing generated file and server listener. Done means the proto TypeScript file is generated and the server listens on its configured port.

Written by the indexing model from the issue text.