Migrate to const blobby parsing #1273

Job	Run time
set-msrv / set-msrv	4s
minimal-versions / minimal-versions	35s
build (1.85.0, thumbv7em-none-eabi)	1s
build (1.85.0, wasm32-unknown-unknown)	24s
test (1.85.0)	20s
build (stable, wasm32-unknown-unknown)	47s
build (stable, thumbv7em-none-eabi)	20s
test (stable)	19s
	2m 50s

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