[Feature Request] Colorizing with a specific theme

Context

• This issue is not a bug report. (please use a different template for reporting a bug)
• This issue is not a duplicate of an existing issue. (please use the search to find existing issues)

Description

I see that colorizeElement supports being given a theme, but colorize doesn't.

I'd like to pass a specific theme to colorize as well, and have it write the styles inline in the output string, so that I can use different themes for different things at the same time.

Example use case: a github-like markdown editor, where the editor has a light theme just like the preview, but perhaps code blocks rendered in the preview use a dark theme, for better contrast and an arguably more interesting design choice.