feat: Add projectAPI support to EfServices module

Resolves #50 (closed)

This MR adds the following:

• Project and InterestGroup models
• Bot stubbing support to the EfUser model
• ProjectAPI support
• ProjectService to fetch data from caches
• Precaches for InterestGroup and Project entities through a provider for each entity type
• Testing with a mocked ProjectAPI

These changes were tested for stability through local integration with the git-eca-API. All git-eca-API tests have passed