Feat(pkg/e3): Complete testing for E3 client code.
Chore(e3/defaultDepth/redirect): Slight changes. Moving things around.
Feat(go.mod): Dependency cleanup. Removed some.
Feat(private files): Upload files to E3 as private.
Feat(e3): Making E3 integration better. Adding tests. Potentially use as
future ref to pointer users toward to help them implement E3.
WIP(*): Project init.