Define 1.2 encode acceleration roadmap #248

Job	Run time
Miri	18m 44s
Format, lint, test, and audit	1m 29s
no_std target build (aarch64-unknown-linux-gnu)	22s
no_std target build (thumbv7em-none-eabihf)	18s
no_std target build (x86_64-unknown-freebsd)	20s
Platform tests (ubuntu-latest)	33s
no_std target build (x86_64-unknown-linux-gnu)	17s
Platform tests (macos-26)	31s
Platform tests (macos-15-intel)	1m 1s
Platform tests (macos-15)	42s
no_std target build (wasm32-unknown-unknown)	20s
Platform tests (windows-latest)	54s
Platform tests (macos-latest)	26s
	25m 57s

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