Make timeout for evaluation on hover configurable

[timvahlbrock]

Is your feature request related to a problem? Please describe.
Currently, value evaluation for hovering is timed out after 500ms. If CDP communication plus evaluation within the browser takes longer than 500ms, no hover value is shown.

Describe the feature you'd like
The situation can be resolved in one of the following ways.

• Increase the timeout
• Remove the timeout all together
• Make the timeout configurable within launch or workspace options

Furthermore, VS Code hovering delays the creation of the debug hover by one second to make the UI less hectic (see #2309). Evaluation could be started as soon as hovering is detected, so that the time required for evaluation falls within the UI delay. But this would likely require changes in VS Code itself.

[connor4312]

Sure, PR's welcome. I think raising it is probably fine, but a setting is ok too.