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Adds `system.setLenUninit` for the `string` type. Allows setting length without initializing new memory on growth. - Required for a follow-up to #15951 - Accompanies #22767 (ref #19727) but for strings - Expands `stdlib/tstring` with tests for `setLen` and `setLenUninit` --------- Co-authored-by: Andreas Rumpf <araq4k@proton.me>