Use prompt buffer for Console

Like VSCode does, compbine console and stdout, and allow you to enter
commands in the console. It's all a bit janky right now and the
insertion point isn't ideal (as not all output is interactive) and some
output is asynchronous via a somewhat different channel.

autoload/vimspector.vim

@@ -89,6 +89,12 @@ function! vimspector#AddWatchPrompt( expr ) abort
   call vimspector#AddWatch( a:expr )
 endfunction
 
+function! vimspector#EvaluateConsole( expr ) abort
+  stopinsert
+  setlocal nomodified
+  py3 _vimspector_session.EvaluateConsole( vim.eval( 'a:expr' ) )
+endfunction
+
 function! vimspector#ShowOutput( category ) abort
   py3 _vimspector_session.ShowOutput( vim.eval( 'a:category' ) )
 endfunction