Detect bracketed paste capable terminals

[gnodet]

The bracketed paste on/off strings are displayed when the terminal does not support bracketed paste mode:

←[?2004hEnter input>foo
←[?2004lInvalid input

As a workaround, calling the following method on Windows platform should do the trick:

reader.unsetOpt(Option.BRACKETED_PASTE);

Maybe we could change the default on Windows platform : it should be possible to detect probably working terminals (using OSUtils.IS_CONEMU or using WT_SESSION as indicated in microsoft/terminal#1040.