Add support for Common Sense Media

[JonnyWong16]

Description

Add support for Common Sense Media

Ref.: https://forums.plex.tv/t/age-appropriate-ratings-from-commonsensemedia-org/97954/52
Ref.: https://support.plex.tv/articles/common-sense-media/

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the docstring for new or existing methods
• I have added tests when applicable

[Copilot]

Pull Request Overview

This PR adds support for Common Sense Media ratings and information to the PlexAPI library, allowing users to retrieve age ratings, parental advisories, and talking points for movies and TV shows.

Key changes:

• Added CommonSenseMedia, AgeRating, TalkingPoint, and ParentalAdvisoryTopic classes to represent Common Sense Media data
• Integrated Common Sense Media properties into Movie and Show classes
• Added comprehensive test coverage for the new functionality

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
plexapi/media.py	Implements new Common Sense Media data classes with full attribute definitions and reload functionality
plexapi/video.py	Adds commonSenseMedia property to Movie and Show classes; fixes minor documentation inconsistencies
plexapi/utils.py	Registers new tag types for Common Sense Media support
tests/test_video.py	Adds test cases for Common Sense Media functionality, both basic and full data retrieval

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