Sql memory plugin

[chr1st0ph3rGG]

Implement a memory plugin with sqlite as backend (as a default database) I would prefere if we use https://github.com/tiangolo/sqlmodel as we are already using pydantic.

• [ ] This memory should have a concept of sessions. In it we should save the conversation, (with channel dependent message ids!) and add a text field for summarizing the session.
• [ ] Summarize a session when it ends, can be disabled
• [ ] Add the functionality to delete a session (I guess we need a command parser plugin so we can channel independent run commands that would not go thru the whole workflow)
• [ ] Add the functionality to end a session
• [ ] summarized sessions should be added to a system prompt output

[chr1st0ph3rGG]

As already mentioned in #39 this plugin will be bumped back to v0.2.0