extract file-download crate to remove solana-runtime dep from cargo-b… #6577

Job	Run time
ios (macos-13, aarch64-apple-ios)	4m 21s
android (ubuntu-20.04, x86_64-linux-android)	2m 48s
ios (macos-13, x86_64-apple-ios)	3m 27s
android (ubuntu-20.04, aarch64-linux-android)	3m 1s
ios (macos-13, aarch64-apple-darwin)	3m 48s
android (ubuntu-20.04, i686-linux-android)	2m 56s
ios (macos-13, x86_64-apple-darwin)	4m 44s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 20s
error_reporting	0s
	28m 25s

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