[lib] Move minimallyEncodedPermissions types/type utils to separate file

Summary: This is an attempt to resolve circular dependency issue...

Test Plan: Hopefully will be able to proceed without Jest import issues. Will resolve merge conflicts and then HOPEFULLY will be able to put up refactoring diffs.

Reviewers: ashoat, ginsu, tomek, rohan

Reviewed By: ashoat

Subscribers: wyilio

Differential Revision: https://phab.comm.dev/D9808