Syllable level diffs

[ngawangtrinley]

• [ ] Syllable diff should be added to fast-dmp

Reference:

• https://github.com/OpenPecha/diff-layer-formatter
• Ask @10zinten for his code for syllable level diff in proofreading editor

[10zinten]

here is the code https://github.com/OpenPecha/OpenPecha-API/blob/main/app/app/services/diff.py