Support all MarkdownStyleSheet properties in the Markdown widget #2154
Description
The Markdown widget currently only exposes textStyle and linkStyle. The underlying flutter_markdown package's MarkdownStyleSheet supports ~60 properties (headings, code blocks, blockquotes, tables, lists, spacing, etc.) that are not accessible.
We should expose the full set of MarkdownStyleSheet styling properties in the MarkdownController and wire them through to copyWith(), and also test whether the existing properties work or not.
Ref: modules/ensemble/lib/widget/markdown.dart