Updated the behaviour of commands:
- `lmcli edit` - no longer deletes messages past the edited message
- `lmcli retry` - creates a branch from the previous user message
Instead of CreateChatCompletion* accepting a pointer to a slice of reply
messages, it accepts a callback which is called with each successive
reply the conversation.
This gives the caller more flexibility in how it handles replies (e.g.
it can react to them immediately now, instead of waiting for the entire
call to finish)
- Split pkg/cli/cmd.go into new pkg/cmd package
- Split pkg/cli/functions.go into pkg/lmcli/tools package
- Refactor pkg/cli/openai.go to pkg/lmcli/provider/openai
Other changes:
- Made models configurable
- Slight config reorganization
