Support cursor positioning in ui components

[jvalkeal]

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Currently when ui component is rendered cursor is hidden as its position is always 0,0. It would be beneficial to have cursor in a specific location for better feedback to a user and helping with screen readers, etc.

Cursor could be in a follow "mypath" value user is typing

? Enter value mypath
ℹ Path ok

In selectors it could follow selected line

? testSimple [Use arrows to move], type to filter
❯ key1
  key2

User can also type but we should not try to place cursor withing "filtering" as it would already be in selected line

? testSimple [Use arrows to move], filtering '1'
❯ key1                                      

Essentially if we add support for cursor it should be placed where it helps user a most. It would also be nice to let user to choose if cursor is visible or not.