Add support for casei and accenti #556

Job	Run time
changes	4s
sdist	11s
macos (x86_64)	27s
linux (x86_64)	55s
macos (aarch64)	36s
windows (x64)	1m 22s
linux (x86)	1m 3s
windows (x86)	1m 29s
linux (aarch64)	1m 19s
linux (armv7)	1m 20s
linux (s390x)	1m 23s
linux (ppc64le)	1m 25s
Build and push base postgres image	0s
Build and push base pyrust	0s
test	0s
	11m 34s

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