Use a named tuple for tags and branches data

[stsewd]

We are passing a list of dictionaries with verbose_name and identifier, we should use a data structure for this instead to avoid bugs. We need to make sure that celery can serialize named tuples.

ref https://github.com/readthedocs/readthedocs.org/pull/7548#discussion_r542636920

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[astrojuanlu]

Reference: https://github.com/readthedocs/readthedocs.org/blob/b8eb7728c59be744570d9d600634c2cd396cc126/readthedocs/builds/tasks.py#L256-L264

[vitorsv1]

Hey, I am really interested in this Issue. I'll work on it as my first contribution to the project

[humitos]

Update: instead of using NamedTuples, we want to use dataclasses 🚀

[skv0zsneg]

Hi! Wow, there is 2 years since last PR referenced to this issue was created. Is it task still in need? I would like to help!