Introduce `feast test` to run tests on transformations

**Is your feature request related to a problem? Please describe.**
We should introduce a `feast test` cli tool to allow users to run tests similar to `dbt run test`

**Describe the solution you'd like**
A development experience for feature transformation equivalent to https://docs.getdbt.com/docs/build/data-tests

**Describe alternatives you've considered**
N/A

**Additional context**
Right now we run type inference and engineers end up coding their own unit tests. Unit tests are good too and should complement pytest but it'd be nice to have this support out of the box for MLEs to feel confident about their feature transformations.