use audio cue to signal no inlay hints can be read

[jrieken]

This PR extends #142532 by playing an audio cue whenever users ask to read the current line with inlay hint but when there are none.

[jrieken]

fyi @hediet and @isidorn - let me know what you think about this audio cue usage and if that's something that we want.

The change is a bit complex because audio cues are workbench only. Therefore I had to extract some inlay hint bits into workbench as well. The gist is

• a new cue for no inlay hints (uses error source)
• play that cue when asking for inlay hints when there are none

[hediet]

Nice ;) Left some feedback.

[isidorn]

It is not audioClues it is audioCues :)

[jrieken]

fixed in main

[isidorn]

Cool work!
I think this should follow the pattern that we do for all other features. If the audioCue setting is "on" that means the sound is played when the cursor is on a line with inlay hints. So a user can trigger an additional command to learn more.
I do not think we need a sound for "no inlay hints". Silence will carry that meaning.

[isidorn]

I tried it out and some more feedback:

1. "Read line with inlay hints" -> I think we should rename this command to be be more general and that we can potentially use it for all editor richness in the future. I am not sure what is the right name, but I will think about it
2. I will ping the screen reader users so they try it out so we get immediate feedback. @jrieken do you know if inlay hints are available in Java, Python, C++ just so I know how to tell users to try it out
3. I am a bit worried about only esc and tab going out of this mode. Ideally any key or at least left/right/up/down would take you out
4. I do not think there is a need for "stop reading" to be in the command palette

All in all, cool work and I think we should just re-think some things so we can build more on top of this :)