feat!: Allow configuring the downloader when creating a blobs protocol handler #263

Job	Run time
Android Build Only (aarch64-linux-android)	1m 13s
Checking docs	56s
Android Build Only (armv7-linux-androideabi)	1m 10s
Checking fmt	20s
check_semver	1m 22s
clippy_check	1m 4s
Cross Build Only (x86_64-unknown-freebsd)	50s
Cross Test (i686-unknown-linux-gnu)	1m 12s
cargo deny	30s
codespell	7s
Minimal Supported Rust Version	1m 1s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 39s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 8s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 8s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 50s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 16s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	54s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 4s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 47s
	20m 32s

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