[Feature Request] option to show X number of surrounding lines in the resultant diff

[pavan-kalyan]

Currently the entire file is displayed. This is inconvenient to manually review as these files can be hundreds of lines.
It would be nice to have flag that allows us to only display x number of surrounding lines of the actual diff.

Something like -C 10 for helm diff plugin would show 10 surrounding lines for each change detected.

I guess changes would need to be made somewhere here