add Kconfig parser (#1681) #875

Job	Run time
Build documentation	1m 24s
Test (stable)	1m 19s
Bench	1m 7s
Test (beta)	1m 26s
Coverage	1m 14s
Check formatting	8s
Test (nightly)	1m 18s
Test (1.65.0)	1m 31s
Test minimal rust version	31s
Test (stable, --features "std")	1m 48s
Test (stable, --no-default-features)	1m 10s
Test (stable, --no-default-features --features "alloc")	1m 16s
Test (nightly, --no-default-features)	1m 0s
Test (nightly, --no-default-features --features "alloc")	1m 29s
	16m 41s

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