Regression Test Pipeline

[Abhinay1997]

• Add English text normlaization.
• Add WER calculations.
• Compare and check norm outputs from Python implementation
• Add WER to the regression tests once Memory and Latency Regression Tests #99 is merged

[Abhinay1997]

Code is still messy. Needs cleanup once the normalization starts working.

[Abhinay1997]

Running tests locally. Adding more unit tests for the new normalization code.

[atiorh]

@Abhinay1997 As discussed offline, here are the last few items before we can merge this one:

• Removing example test result JSONs
• Removing the Fraction implementation altogether
• Adding AudioEncoder latency measurements to LatencyStats

We discussed the following as nice to haves (could defer to a future PR):

• Writing the following static attributes to the resulting JSON:

"static_attributes": 
- whisperkit_version (string)
- os (string)
- encoder_compute_units (string)
- decoder_compute_units (string)
- enable_word_timestamps (boolean)
- enable_eager_decoding (boolean)
- enable_vad (boolean)
- silence_threshold 
- is_low_power_mode (boolean)
- is_stream_simulated (boolean)

• Periodically (e.g. 1 minute) measuring the following stats in a separate thread and writing the timeseries results to the final JSON:

"system_measurements":
- thermal_state (string)
- device_temperature (int)
- memory_total_available_gb (float)
- memory_total_used_gb (float)
- memory_app_allocated_gb (float)
- memory_app_used_gb (float)
- memory_swap_used_gb (float)
- battery_level (float)
- disk_total_space_gb (float)
- disk_free_space_gb (float)

[Abhinay1997]

@atiorh made the changes except for the AudioEncoder latency stats. Need to add a callback for that. Discussing with Zack on this.