feat!: Allow configuring the downloader when creating a blobs protocol handler #268

Job	Run time
Android Build Only (aarch64-linux-android)	1m 28s
Cross Build Only (x86_64-unknown-freebsd)	53s
Android Build Only (armv7-linux-androideabi)	1m 14s
cargo deny	30s
Checking docs	1m 40s
Checking fmt	32s
check_semver	1m 25s
clippy_check	2m 19s
codespell	4s
Cross Test (i686-unknown-linux-gnu)	1m 34s
Minimal Supported Rust Version	1m 44s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 5s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 2s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 23s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 16s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 51s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 33s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	56s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 25s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 17s
	28m 11s

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