[vi-mode] Support di' and di" commands

[springcomp]

Prerequisites

• [X] Write a descriptive title.

Description of the new feature/enhancement

As alluded to in #584, PSRL should support vim "text-objects". Consider supporting the di' and di" commands to delete quoted text.

Proposed technical implementation details (optional)

Most of the ground work done to support Text Objects with respect to key chords has already been laid. This feature will be very easy to implement and only involves wiring a couple of new keybindings.