Adding conduit API method to find owner for the affected file

Summary:
Adding method that given a path will go up the folder hierarchy until it finds
the owning package
and return owners for that package.

Task ID: #403724

Test Plan:
Tried the new API call through console on various path combinations

Reviewed By: epriestley
Reviewers: epriestley, dpepper, tuomaspelkonen
CC: epriestley, Leon
Revert Plan:
n/a

Tags: bootcamp, Push Efficiency

• begin *PUBLIC* platform impact section -

Bugzilla: #

• end platform impact -

Differential Revision: 126