[core] Use Locale.ROOT for every case conversion in main sources - #9771

[core] Use Locale.ROOT for every case conversion in main sources#9771

JingsongLi merged 11 commits into

apache:masterapache/paimon:masterfrom

LuciferYang:fix/stringutils-tolowercase-localeLuciferYang/paimon:fix/stringutils-tolowercase-localeCopy head branch name to clipboard