[Feature]: Avoid using absolute path in manifest for bundle diff

[jsun969]

What problem does this feature solve?

While using bundle diff, it only supports absolute path in manifest.json, which requires me to modify every path in the file.

What does the proposed API look like?

• Support relative path for bundle diff.
• Generate relative path for manifest.json (maybe rsdoctor manifest --to-relative <path_to_manifest>)