Update "Conversation API how-to guide" too show the code for every language

[bibryam]

What content needs to be created or modified?
The following How-to guide lacks consistent code samples
https://v1-16.docs.dapr.io/developing-applications/building-blocks/conversation/howto-conversation-layer/

Describe the solution you'd like
Add code samples, and relevant links

Where should the new material be placed?
In the same page

[bibryam]

/assign

[msfussell]

resolved