Add Text and Image document support for ollama model provider#13

SasinduDilshara merged 6 commits intoballerina-platform:mainballerina-platform/module-ballerinax-ai.ollama:mainfrom

SasinduDilshara:integrate-chat-changesSasinduDilshara/module-ballerinax-ai.ollama:integrate-chat-changesCopy head branch name to clipboard