Feat: dvipsnames and svgnames color palettes

[christopher-hampson]

Overview: What does this pull request change?

• Adds color palettes for DVIPSNAMES and SVGNAMES for colors commonly used in LaTeX via the xcolor package.
• Additional color palettes are accessed in the same way as current palettes/standards already implemented. For example:

    >>> from manim import DVIPSNAMES
    >>> DVIPSNAMES.DARKORCHID
    ManimColor("#A4538A")

    >>> from manim import SVGNAMES
    >>> SVGNAMES.LIGHTCORAL
    ManimColor("##EF7F7F")

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

• Provides access to colors that users may be familiar with from typsetting documents/slides in LaTeX, without users needing to lookup and define these themselves.

Links to added or changed documentation pages

Further Information and Comments

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

[JasonGrace2282]

The changes look good to me! Some other stuff:

Do you mind updating this part of the docs?
https://manimce--3913.org.readthedocs.build/en/3913/reference/manim.utils.color.html

[JasonGrace2282]

Single backticks are italics in sphinx, I think inline code looks nicer ;)

Suggested change

	as named colors in LaTeX via the `\\usepackage[dvipsnames]{xcolor}` package.
	as named colors in LaTeX via the ``\\usepackage[dvipsnames]{xcolor}`` package.

You also might want to use a raw docstring - add an r to the beginning of """, and then you can get rid of the double \\

[JasonGrace2282]

Same as above

Suggested change

	accessed as named colors in LaTeX via the `\\usepackage[svgnames]{xcolor}` package.
	accessed as named colors in LaTeX via the ``\\usepackage[svgnames]{xcolor}`` package.