pybricks: add __init__.py

This file was missing which breaks some tools that don't know about
namespace packages. Also `from pybricks import version` is a thing.

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 <!-- refer to https://keepachangelog.com/en/1.0.0/ for guidance -->
 
+## Unreleased
+
+## Added
+- Added `__init__.py` to `pybricks` package.
+
 ## 3.2.0b1 - 2022-06-02
 
 ### Added

src/pybricks/__init__.py

@@ -0,0 +1,8 @@
+from typing import Tuple
+
+
+version: Tuple[str, str, str] = (
+    "hub",
+    "3.2.0b1",
+    "v3.2.0b1-GIT_HASH on DATE",
+)