[Feature Request] enable retention of size of docs popup

Context

• This issue is not a bug report. (please use a different template for reporting a bug)
• This issue is not a duplicate of an existing issue. (please use the search to find existing issues)

Description

When the completions popup is resized, this new size is passed to IStorageService.store. Therefore theoretically it could be persisted to localStorage or some other persistent store (as per https://stackoverflow.com/questions/71293521/monaco-saving-preferences-to-localstorage).

However when the docs popup is resized, Monaco does not appear to save the new size:

Test in 0.31.1