feat!: Allow configuring the downloader when creating a blobs protocol handler #322

Job	Run time
Checking docs	1m 6s
cargo deny	31s
Android Build Only (aarch64-linux-android)	1m 9s
Android Build Only (armv7-linux-androideabi)	1m 9s
Checking fmt	22s
check_semver	1m 22s
clippy_check	1m 49s
codespell	3s
Cross Build Only (x86_64-unknown-freebsd)	50s
Cross Test (i686-unknown-linux-gnu)	1m 31s
Minimal Supported Rust Version	1m 7s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 19s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 39s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 31s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 6s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 12s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 24s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 30s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	58s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 27s
	26m 5s

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