Support for colorMoved in kitty diff

[bendem]

Is your feature request related to a problem? Please describe.
I'm used to review diffs using the command line and it's very useful to get lines that moved without changes in a different color so I know I don't need to review the whole block but just where it has been relocated. I have not found an equivalent with kitty

Describe the solution you'd like
Some way to display lines that moved with a specific background or foreground color

Describe alternatives you've considered
I don't know

Additional context
Add any other context or screenshots about the feature request here.

Example of the display with colorMoved = dimmed-zebra:

[kovidgoyal]

Not something I care about, but patches are most welcome. Relevant code
is all in kittens/diff