feat: improve text_normalize in english.py

[Ishita-190]

Fixes: #53

Changes Made

• Replaced minimal punctuation mapping with extended support for smart quotes, dashes, ellipsis, and CJK punctuation.
• Added uppercase and digit handling for normalize_numbers.
• Stripped accents consistently using Unicode normalization.
• Expanded abbreviations (i.e. to that is, e.g. to for example) with word-boundary and case-insensitive matching.
• Handled consecutive punctuation safely to avoid reference leaks.
• Normalized whitespace and ensured terminal punctuation for TTS stability.

All the changes are working properly