Is your feature request related to a problem? Please describe.

Current high-level implementation of multimodality is relying on a specific prompt format.

Describe the solution you'd like

Models like Obsidian work with llama.cpp server and have a different format. It would be nice to have a high-level API for multimodality in llama-cpp-python to be able to pass image/images as an argument after initializing Llama() with all the paths to required extra-models, without relying on a pre-defined prompt format such as Llava15ChatHandler.

Describe alternatives you've considered
Alternatively, a custom prompt format class that supports images can be implemented, where prompt string is passed as an argument.