feat(primitives): add and use foldhash as default hasher #2071

Job	Run time
docs	35s
check no_std	49s
clippy	54s
fmt	14s
features stable	1m 36s
miri --no-default-features	4m 47s
features stable --all-targets	2m 55s
miri	4m 52s
features nightly	1m 38s
test ubuntu-latest stable --no-default-features	1m 12s
miri --all-features	7m 28s
wasm	23s
features nightly --all-targets	2m 48s
test ubuntu-latest stable	1m 4s
test ubuntu-latest nightly --no-default-features	46s
test ubuntu-latest nightly	48s
test ubuntu-latest 1.79 --no-default-features	30s
test ubuntu-latest 1.79	31s
test windows-latest stable --no-default-features	2m 21s
test windows-latest stable	2m 21s
test windows-latest nightly --no-default-features	2m 2s
test windows-latest nightly	1m 52s
test windows-latest 1.79 --no-default-features	1m 16s
test windows-latest 1.79	1m 17s
test ubuntu-latest 1.79 --features json	32s
test windows-latest 1.79 --features json	1m 35s
test ubuntu-latest nightly --all-features	1m 6s
test windows-latest nightly --all-features	2m 49s
	51m 1s

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