Refactor pica format expressions #2326

Job	Run time
check	26s
deny (bans licenses sources)	39s
miri ${{ matrix.item.name }}	0s
deny (advisories)	33s
cross ${{ matrix.target.triple }} - ${{ matrix.target.toolchain }}	0s
fuzz ${{ matrix.item.name }}	0s
msrv	36s
test x86_64-unknown-linux-gnu - stable	2m 23s
test x86_64-unknown-linux-gnu - beta	2m 22s
test x86_64-unknown-linux-gnu - nightly	2m 4s
test x86_64-apple-darwin - stable	1m 53s
test x86_64-pc-windows-gnu - stable	4m 41s
test i686-pc-windows-msvc - stable	4m 15s
clippy	40s
careful	2m 42s
docs	31s
audit	0s
fmt	20s
outdated	25s
udeps	57s
ci	0s
	25m 27s

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