Add toggle to allow Markdown in "Comments" Tab in Entry Editor

[ThiloteE]

Is your suggestion for improvement related to a problem? Please describe.
I want to store my AI generated summaries somewhere, because everytime I restart JabRef, they get deleted. Sometimes I want to generate multiple summaries of the same scientific paper. I opted to store the summaries in the comments section of JabRef, but the comments section does not support Markdown and that's annoying, because I want to have responses formated in Markdown.

Describe the solution you'd like
Add toggle that allows users to switch between "Markdown" and "Plaintext" mode.

Additional context
There is currently work being done on adding Markdown to the AI-Chat tab (see #12234), so to add this feature here, some of the code could potentially be re-used. There already is a toggle in the AI-Summary tab.

[priyanshu16095]

I am interested in this issue. Please assign me this issue.