common: move download functions to download.(cpp|h) (#17059)
* common: move download functions to download.(cpp|h) * rm unused includes * minor cleanup --------- Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
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* common: move download functions to download.(cpp|h) * rm unused includes * minor cleanup --------- Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>