extract file-download crate to remove solana-runtime dep from cargo-build-sbf #12724

Job	Run time
cargo-test-sbf (token/program)	10m 15s
check	4m 49s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	16m 1s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 24s
test (single-pool/cli, single-pool/program)	16m 17s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	8m 18s
test (token-upgrade/cli, token-upgrade/program)	14m 49s
cargo-test-sbf (token-upgrade/program)	8m 47s
cargo-test-sbf (feature-proposal/program)	8m 56s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 19s
cargo-test-sbf (memo/program)	6m 41s
cargo-test-sbf (name-service/program)	7m 14s
cargo-test-sbf (stake-pool/program)	12m 40s
cargo-test-sbf (single-pool/program)	7m 51s
	2h 29m 21s

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