chore(primitives): remove Fx* aliases #2034

Job	Run time
miri --no-default-features	4m 37s
test ubuntu-latest stable --no-default-features	1m 4s
miri	4m 50s
check no_std	53s
test ubuntu-latest stable	1m 0s
miri --all-features	6m 54s
clippy	55s
test ubuntu-latest nightly --no-default-features	1m 0s
test ubuntu-latest nightly	48s
docs	30s
features stable	1m 37s
wasm	27s
features stable --all-targets	2m 43s
features nightly	53s
test ubuntu-latest 1.79 --no-default-features	26s
features nightly --all-targets	3m 0s
test ubuntu-latest 1.79	33s
fmt	15s
test windows-latest stable --no-default-features	2m 58s
test windows-latest stable	44s
test windows-latest nightly --no-default-features	2m 44s
test windows-latest nightly	2m 8s
test windows-latest 1.79 --no-default-features	1m 34s
test windows-latest 1.79	1m 3s
test ubuntu-latest 1.79 --features json	35s
test windows-latest 1.79 --features json	1m 24s
test ubuntu-latest nightly --all-features	1m 8s
test windows-latest nightly --all-features	2m 37s
	49m 20s

Provide feedback