[lib] Resolve circular dependency issue w/ MinimallyEncoded*Info validators

Summary:
Moving the regex validators to main minimally-encoded-thread-permissions file makes the validator file a "leaf node" (except for tests) and resolves the circular dependency issue. Also updated validators to spread in base validators.

Depends on D9811

Test Plan: Jest tests run without issue

Reviewers: ashoat, ginsu, tomek, rohan

Reviewed By: ashoat

Subscribers: wyilio

Differential Revision: https://phab.comm.dev/D9832