rename to halo2_gadgets_optimized #265

Job	Run time
Test on ubuntu-latest	10m 36s
Bitrot check	1m 50s
Test on windows-latest	15m 5s
Book tests	1m 21s
Test on macOS-latest	12m 56s
Test on ubuntu-latest with beta features	11m 5s
Build target wasm32-unknown-unknown	1m 46s
Build target wasm32-wasi	1m 37s
Test on windows-latest with beta features	15m 3s
Code coverage	21m 37s
Test on macOS-latest with beta features	17m 12s
Test on ubuntu-latest with nightly features	12m 55s
Test on windows-latest with nightly features	16m 46s
Intra-doc links	1m 32s
Rustfmt	17s
Test on macOS-latest with nightly features	19m 43s
Test on i686-unknown-linux-gnu	22m 18s
Test on i686-unknown-linux-gnu with beta features	22m 40s
Test on i686-unknown-linux-gnu with nightly features	26m 57s
	3h 53m 16s

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