Feature Request: Hover Documentation for Csound Opcodes

[DMGiulioRomano]

Description

Currently, I see that it's possible to view the documentation popup when using auto-completion, which is very helpful. However, it would also be useful to have the ability to see a tooltip with the documentation when simply hovering over an opcode in the editor.

Expected Behavior:

• When hovering over an opcode (e.g., oscil, out, ftgen), a tooltip appears with a brief description and relevant details.
• This would function similarly to the auto-completion popup but be accessible without needing to trigger auto-completion.

## Use Case:
This feature would improve workflow efficiency by allowing quick access to opcode descriptions without requiring the user to re-trigger auto-completion or open the manual separately.

Additional Context:

Would it be possible to integrate this using the existing documentation system? Since the data is already available in auto-completion, perhaps it could also be displayed on hover?

Thank you for your work on this extension!

[rorywalsh]

Should be possible. I can take a look when I get a chance. Feel free to follow up in a week or so in case I get sidetracked with other things!