Add jtbc.co.kr extractor

[seproDev]

IMPORTANT: PRs without the template will be CLOSED

Description of your pull request and other information

Added extractor for JTBC a Korean TV network.

Template

Before submitting a pull request make sure you have:

• At least skimmed through contributing guidelines including yt-dlp coding conventions
• Searched the bugtracker for similar pull requests
• Checked the code with flake8 and ran relevant tests

In order to be accepted and merged into yt-dlp each piece of code must be in public domain or released under Unlicense. Check all of the following options that apply:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Fix or improvement to an extractor (Make sure to add/update tests)
• New extractor (Piracy websites will not be accepted)
• Core bug fix/improvement
• New feature (It is strongly recommended to open an issue first)

Copilot Summary

🤖 Generated by Copilot at 36e17a0

Summary

✨📺🇰🇷

Add support for downloading videos and playlists from the JTBC website, a Korean TV network. Add two new extractors, JTBCIE and JTBCProgramIE, in the jtbc.py module and register them in _extractors.py. Add test cases for the new extractors.

JTBCIE extracts
videos from Korean network
autumn leaves streaming

Walkthrough

• Add jtbc.py module that defines extractors for JTBC website (yt_dlp/extractor/jtbc.py)