[FR] Set a dark and light theme

[Trikzon]

Is your feature request related to a problem? Please describe.
I would like to be able to set a dark and light theme for shiki to use depending on which "base color scheme" is set in Obsidian's appearance tab. I use "adapt to system," so it changes throughout the day for me.

Describe the solution you'd like
Instead of just having one option for a theme give the user two options for theme, one for dark and one for light.

Additional context
Here is how the AnuPpuccin theme allows a user to choose a different "flavor" and "accent" for both the light and dark color schemes. I would expect something similar for this plugin for choosing a shiki theme for both light and dark.