feat: add middleware check_witness (#356) #1240

Job	Run time
Bitrot check	1m 24s
Build target wasm32-unknown-unknown	2m 31s
Intra-doc links	56s
Run the examples	1m 33s
Build target wasm32-wasi	2m 23s
Test on ubuntu-latest with basic features	4m 1s
Rustfmt	16s
Test on windows-latest with basic features	8m 27s
Test on macOS-latest with basic features	3m 31s
Test on ubuntu-latest with all features	4m 24s
Test on windows-latest with all features	9m 7s
Test on macOS-latest with all features	4m 24s
	42m 57s

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