[Java Client] Add sample code about using shared product

[gong-yu]

No description provided.

[jessiejuachon]

@surite , could you help include this in CI when ready? My plan is to create a shared library jar and then use it in the sample app. So we need CI to build the shared library jar, then add it to lib folder of the sample app.

[jessiejuachon]

@surite, please add it to CI smoke test:

1. Build the shared lib
2. Use the shared lib jar in sample-app-with-shared-lib
3. Build sample-app-with-shared-lib
4. Run sample-app-with-shared-lib jar

[jessiejuachon]

@gong-yu , this is now ready for testing.