feat!: Allow configuring the downloader when creating a blobs protocol handler #260

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	52s
cargo deny	28s
Android Build Only (aarch64-linux-android)	1m 12s
Checking docs	1m 8s
Android Build Only (armv7-linux-androideabi)	1m 8s
Checking fmt	19s
check_semver	2m 2s
clippy_check	1m 24s
Cross Test (i686-unknown-linux-gnu)	1m 12s
codespell	6s
Minimal Supported Rust Version	58s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 45s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 15s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 1s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 34s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 9s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 44s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 35s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	1m 1s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 15s
	24m 8s

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