Save and restore console history.

[Rhys van der Waerden]

Use case:
I would like to be able to press up arrow to get commands from the previous play mode session in the editor.

Proposed solution:

Expose methods to get and restore command history. This leaves the implementation up to the user. This way I could use EditorPrefs to save the history in the editor, or a text file in build.

Version: 2.6.3 (not listed in dropdown)

Relevant discord discussion: https://discord.com/channels/356547922227101706/449218024923201537/1030383292056354817