Add `!^` and `!$` operator #1698

Job	Run time
check	1m 20s
fuzz record_ref	6m 43s
fuzz select_query	8m 20s
fuzz byte_record	11m 33s
fuzz fuzz_path	12m 34s
test x86_64-unknown-linux-gnu (stable)	1m 50s
test x86_64-unknown-linux-gnu (beta)	1m 58s
test x86_64-unknown-linux-gnu (nightly)	2m 51s
test x86_64-apple-darwin (stable)	2m 22s
test x86_64-apple-darwin (beta)	2m 20s
test x86_64-apple-darwin (nightly)	3m 20s
test x86_64-pc-windows-gnu (stable)	3m 34s
test i686-pc-windows-msvc (stable)	3m 40s
cross x86_64-unknown-linux-gnu (stable)	1m 20s
cross x86_64-unknown-linux-gnu (beta)	1m 24s
cross x86_64-unknown-linux-gnu (nightly)	2m 8s
cross x86_64-unknown-linux-musl (stable)	1m 22s
cross aarch64-unknown-linux-gnu (stable)	1m 42s
cross aarch64-unknown-linux-musl (stable)	1m 17s
fmt	26s
clippy	1m 20s
book	3m 7s
udeps	7m 58s
audit	0s
upgrades	0s
gh-pages	0s
	1h 24m 29s

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