Add support for Unicode case folding.

Jeff Davis <jdavis@postgresql.org>

Commit: 4e7f62bc386a479593e4e8ecfb94370f5a88e522
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2025-01-23T17:06:50Z
Releases: 18.0
Add support for Unicode case folding.

Expand case mapping tables to include entries for case folding, which
are parsed from CaseFolding.txt.

Discussion: https://postgr.es/m/a1886ddfcd8f60cb3e905c93009b646b4cfb74c5.camel%40j-davis.com

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