Mux-python

* Adds updated MP4 generation options.

* Adds APIs for retroactive caption generation
* Adds `ingest_type` field on Assets
* Adds fields related to SRT support including `active_ingest_protocol`, `error_severity`,
* Updates Simulcast documentation for SRT support
* Adds several fields to the Data API, including `player_error_code`, `starting_up_viewers`, `playback_failure_error_type_id`, `playback_business_exception_error_type_id`, `video_startup_business_exception_error_type_id`, `error_severity`
* General documentation cleanup across Video and Data APIs

- add support for metric filters for all Data routes
- add support for filtering on insights routes
- additional fields available on list video views endpoint (Viewer Experience Score and Watch Time)
- add support for `primary` on the Track model
- add support for additional Ad Metrics

- Add Web Inputs
- Additional documentation for optional fields
- Updated Mux Data fields
- Cleanup typos
- Fix deprecation warning for urllib3

* Fix release action

* Updates docs for encoding_tier
* Adds `generated_vod` to `text_source` enum
* Pin Python version to ensure we can package for now