Include statistics section in project API for public projects

Problem to solve

Currently it seems that when requesting project information through an API, statistics is not available if you do not have permissions over that project ("reporter" permissions are enough), even when setting statistics=true. I tested the API being authenticated.

This is strange because in UI that information is available to everyone, publicly, for public projects.

Intended users

Anyone using the API who is interested in statistics.

Proposal

Make "statistics" simply public and available for all public projects.

Permissions and Security

Statistics information is not sensitive and for public repositories is already available through other means, but much less efficiently (one could clone a repository to obtain commit count, sizes, or fetch all artifacts).