We have too many likely unused dependencies in ACI, e.g., YouTubeConverter. A lot of them are introduced in openhands_aci/editor/md_converter.py.

However, the upstream OpenHands agent likely didn't need all of these converters. We should:

1. Try to remove converters AND keep the bare minimum list of these converters without degrading GAIA performance
2. Group the rest of the dependencies into groups, so we only install a minimal list of dependencies required to power editor/ when pip install openhands-aci