Fix whisper timestamp extraction for tokenizers with added tokens (#804)
* support user defined tokens by bounding timestamp token if statement
* Update src/tokenizers.js
Co-authored-by: Joshua Lochner <admin@xenova.com>
* calculate timestamp_end instead of hardcoding
* Update tokenizers.js
* Merge conflict resolution
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Co-authored-by: Joshua Lochner <admin@xenova.com>