support imitator v4

[zyaoj]

Why?

Adding support for imitator v4 feature.

How ?

Update our fs to fetch data from s3

Test plan

tested with known file id that has v4 feature

Check list

• Was the content of this PR discussed and approved via a GitHub issue? If so, it fixes #{issue number} (no need for typos or documentation improvements)
• Did you read the contributor guideline?
• Did you make sure that your PR does only one thing instead of bundling different changes together?
• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests?
• Did you verify new and existing tests pass locally with your changes?