Add Kannada (kn-IN) G2P support for TTS

[jasro23]

• Add KannadaG2p class with hybrid dictionary + rule-based IPA conversion
• Add Kannada grapheme and IPA character sets to ipa_lexicon.py
• Add kn-IN locale support with punctuation handling
• Include lexicon with 4K Kannada words
• Add test script with assertions for validation

The G2P module handles:

• All Kannada vowels, consonants, matras (dependent vowels)
• Virama (halant), anusvara, visarga
• Anusvara place assimilation based on following consonant

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What does this PR do ?

Add Kannada (kn-IN) G2P support for TTS

Collection: [TTS]

Changelog

• Add KannadaG2p class in nemo/collections/tts/g2p/models/kn_in_ipa.py for Kannada grapheme-to-phoneme conversion
• Add Kannada grapheme and IPA character sets to ipa_lexicon.py
• Add kn-IN to supported locales with Kannada-specific punctuation
• Add pronunciation dictionary with 4264 Kannada words (kn_IN_nv260318.dict)
• Add Kannada G2P unit tests to test_tts_tokenizers.py

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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Additional Information

• Related to # (issue)

[annagirimokshith]

@jasro23 Can you also add support for Telugu language

[jasro23]

@jasro23 Can you also add support for Telugu language

@annagirimokshith . I am not too familiar with Telugu.

[Copilot]

Pull request overview

Adds Kannada (kn-IN) grapheme-to-phoneme (G2P) support for NeMo TTS, including a new Kannada IPA G2P implementation, locale character sets/punctuation, a pronunciation dictionary, and unit tests.

Changes:

• Introduce KannadaG2p with hybrid dictionary + rule-based IPA conversion.
• Add kn-IN grapheme and IPA character sets plus locale punctuation handling.
• Add a Kannada pronunciation lexicon and basic unit tests validating G2P outputs.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 6 comments.

File	Description
nemo/collections/tts/g2p/models/kn_in_ipa.py	New Kannada G2P implementation (dictionary + rule-based).
nemo/collections/common/tokenizers/text_to_speech/ipa_lexicon.py	Adds kn-IN locale support, including grapheme/IPA sets and punctuation.
scripts/tts_dataset_files/kn_IN/kn_IN_nv260318.dict	New Kannada pronunciation dictionary (~4.3K entries).
tests/collections/common/tokenizers/text_to_speech/test_tts_tokenizers.py	Adds unit tests for Kannada G2P behavior.

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