Implement Basic Vedyut Components (Lipi, Prakriya, Sandhi, Cheda)

[VedantMadane]

Implemented foundational logic for Vedyut Sanskrit library:

• vedyut-lipi: Added full transliteration support for Devanagari, IAST, SLP1, and Harvard-Kyoto. Implemented bidirectional conversion logic using SLP1 as pivot.
• vedyut-prakriya: Implemented a simplified rule-based generator for Bhvadi class roots in Lat (Present) tense, handling Guna, Shap suffix, and Tin endings.
• vedyut-sandhi: Implemented major vowel sandhi rules (Dirgha, Guna, Vriddhi, Yan, Ayadi) for both joining (apply_sandhi) and splitting (split_sandhi) words.
• vedyut-cheda: Implemented a recursive segmenter that utilizes sandhi splitting and a lexicon to find valid word sequences.
• vedyut-core: Updated Python bindings to be compatible with PyO3 0.22 API.
• vedyut-sanskritify: Fixed a lifetime compilation error in vocabulary.rs.

All components are verified with unit tests.

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PR created automatically by Jules for task 4144677439969182435 started by @VedantMadane

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[VedantMadane]

Fix the merge conflicts.

[VedantMadane]

@google-labs-jules fix merge conflicts