feat: Add option to save phone-level confidence scores

[Ariyan-Ch]

This feature introduces a new --save_phone_confidence flag to the align_one command. When this flag is enabled, it saves a CSV file named <sound_file_name>_confidence.csv containing detailed phone-level alignment information. This information was already created, but never stored. This addition adds a flag to store that list of confidence scores.

The CSV file includes the following columns:

• begin: The start time of the phone interval in seconds.
• end: The end time of the phone interval in seconds.
• phone: The phone label.
• confidence: A confidence score for the phone alignment.

This feature provides users with valuable data for analyzing the quality of phone-level alignments and can be
particularly useful for tasks such as:

• Identifying and correcting mispronunciations.

By providing access to phone-level confidence scores, this feature enhances the utility of the Montreal Forced
Aligner for a wide range of speech analysis and processing tasks.