code block styles (triple-backtick)

In Anytype, I could enter triple-backtick ("```") and an optional syntax type, such as "```text", "```md", "```sh", etc. then shift-enter and begin typing the code block. That isn't implemented yet in Anytwo (it just shows "```text" as regular text). but it's an essential feature for being able to create documentation (listing shell commands), include code snippets. I also use markdown blocks sometimes to paste output from LLMs if pasting into the general editor doesn't look right.