feat(DiffRenderable): synchronize scroll between split view panes in diff.ts

[viralcodex]

Fixes: #563
Hi @kommander and @simonklee,

Added this synced scroll in code diff as mentioned in this issue...

I was thinking to keep both separate and synced scroll which can be toggled through hotkeys depending on user preferences.

Whatever you guys say 😄

opentui4.mov

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commit: 386c622