blobby: add encode and decode bin utils #1311

Job	Run time
linux (i686-unknown-linux-gnu, 1.85.0, sudo apt update && sudo apt install gcc-multilib)	28s
linux (x86_64-unknown-linux-gnu, 1.85.0)	17s
minimal-versions / minimal-versions	17s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	20s
macos (1.85.0)	18s
cross (aarch64-unknown-linux-gnu, stable)	29s
cross (aarch64-unknown-linux-gnu, 1.85.0)	35s
windows (x86_64-pc-windows-gnu, 1.85.0)	45s
windows (x86_64-pc-windows-gnu, stable)	2m 24s
build-only	14s
macos (stable)	19s
linux (x86_64-unknown-linux-gnu, stable)	7s
	6m 33s

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