Fix: Flatten recursion in SplitRecursively to prevent stack overflow (#1127)

* Refactor: Make SplitRecursively iterative to prevent stack overflow

* Refactor: Apply review suggestions for SplitRecursively

* Chore: Revert irrelevant changes in merge_atom_chunks

* fix: Change incorrect error logs to info logs

* fix: Resolve failing test_split_trims_whitespace

Author: siddharthbaleja7