This change expands the supported file MIME types and introduces provider-specific handling for file uploads. For providers like OpenAI and Azure, inline file data is now uploaded via `litellm.acreate_file` to obtain a `file_id`, which is then used in the message content. Other providers continue to use base64 encoded file data. Affected functions have been updated to be asynchronous
Merge:https://github.com/google/adk-python/pull/2863
Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 839996848
