Add new method of specifying seed and using warnings.warn

[JasonGrace2282]

Overview: What does this pull request change?

This pull request

• Changes random_seed from a __init__ argument to a class variable, and deprecates the argument in __init__
• Typehints manim.utils.deprecation
• Configures the python stdlib module warnings to use logging.
• Changes manim.utils.deprecation to use warnings.warn

Motivation and Explanation: Why and how do your changes improve the library?

It's fairly tedious to set the seed via

class MyScene(Scene):
    def __init__(self):
        super().__init__(random_seed=3)

It's much nicer to do

class MyScene(Scene):
    random_seed = 3

This also is similar to how it works on the experimental branch.

As for using warnings.warn, this allows us to use the pytest warnings mechanism, which gives better error messages when testing warnings.

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested