* feat: add floating input to ask method
Open a floating input similar to the "edit" input for the "ask" input.
Enabled in config via `Config.windows.ask.floating` or by passing
`{ floating = true }` to the `api.ask` method.
Includes logic to ensure the sidebar uses the correct buffer and selection
if an existing sidebar is open for another code buffer.
Also refactored the `selection` module to extract the floating input
logic into a new `PromptInput` class.
* docs: update config options
* feat: more accurate annotations to prevent user misunderstandings
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Co-authored-by: yetone <yetoneful@gmail.com>
