fix: Make download_ranges compatible with asyncio.create_task(..)
#1591
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Multiple
download_rangesshould be able to run via multiple async tasks in a single event loop.ie when a user runs a code like below , it works
but when a user runs code like below it doesn't work. This PR is fixing this issue. More details in internal b/449916743
This PR achieves the above goal by
read_id_to_writable_buffer_dictinto a class attribute instead of local variable ofdownload_rangesread_idrandom int, instead of orderedi + jread_idto function_id and buffer