Experimental Discord connector

[dluc]

Motivation and Context (Why the change? What's the scenario?)

Allow ingesting Discord messages in memory, to populate memory and trigger AI-driven actions.

Add example, including handler and code to store Discord messages in Postgres.

High level description (Approach, Design)

• Add connector based on DiscordBod.NET to fetch messages. The Discord bot can be added to multiple servers.
• Whenever a message is received serialize the message data and trigger a memory pipeline, uploading the file to content storage.
• Pipeline steps are configurable, in order to process the serialized data with custom logic before doing anything else.