Bring chat.tools.edits.autoApprove logic to core

[Tyriar]

Currently implemented at:

https://github.com/microsoft/vscode-copilot-chat/blob/25ec92a7b6396990cd2238d0cead79defe315cdf/src/extension/tools/node/editFileToolUtils.tsx#L578-L651

I need it for detected file writes in terminal auto approve: #274013

[connor4312]

Will do in debt next week. Not 100% trivial due to some native fs interactions