List all repositories

Summary:
This is the main API method to be used in infra.nasqueron.org.

/repository/getAll It gives a list of repositories,
and for each of them, the tags.

Ref T1461

Test Plan: Browse {{URL}}/repository/getAll

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1461

Differential Revision: https://devcentral.nasqueron.org/D1874