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Stabilize `const_is_char_boundary` and `const_str_split_at`. Tracking issues: #131516, #131518 Stabilized const API: ```rs // in `core` impl str { // const_is_char_boundary feature const fn is_char_boundary(&self, index: usize) -> bool; // const_str_split_at feature, depends on const_is_char_boundary const fn split_at(&self, mid: usize) -> (&str, &str); const fn split_at_mut(&mut self, mid: usize) -> (&mut str, &mut str); const fn split_at_checked(&self, mid: usize) -> Option<(&str, &str)>; const fn split_at_mut_checked(&mut self, mid: usize) -> Option<(&mut str, &mut str)>; } ``` This will allow safely splitting string slices during const-eval. Closes #131516, Closes #131518 This will need FCP. r? libs-api IIUC these do not use any new const language features (i.e. they are implementable manually on stable 1.83.0 using `unsafe`: [playground link](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=3679632cd1041084796241b7ac8edfbd)). Cc ``@rust-lang/wg-const-eval`` (I don't know if I have the permissions for this ping; if not, someone else please ping wg-const-eval if it is necessary)