Add implicit exports into __init__.py

[ssbarnea]

Fixes: #530

[CLAassistant]

All committers have signed the CLA.

[ssbarnea]

@tony Please note that this CLA checker is broken, see below. I even disabled my ad blocker and it still displays and empty form and no buttons.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.38%. Comparing base (48ea20b) to head (765d700). Report is 77 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #531 +/- ## ========================================== - Coverage 88.76% 88.38% -0.38% ========================================== Files 37 37 Lines 3685 3798 +113 Branches 526 549 +23 ========================================== + Hits 3271 3357 +86 - Misses 281 304 +23 - Partials 133 137 +4 ```

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[tony]

@ssbarnea I will cut a feature-level package release so you can try this downstream.

[tony]

@ssbarnea This is live in v0.32.0 (PyPI, release notes, changes)