refactor: derive __version__ from package metadata (single source)

Signed-off-by: disqualifier <dev@disqualifier.me>

src/commons/__init__.py

@@ -3,6 +3,8 @@
 base is stdlib only, no dependencies (the addr geo lookups add aiohttp via the
 `commons[addr]` extra). see each submodule's docstring for its api.
 """
+from importlib.metadata import PackageNotFoundError, version
+
 from . import addr, masking, paths, timing
 from .masking import credit, cvv, mask_proxy, mask_url, phantom, provider
 from .paths import deep_get, deep_set
@@ -53,4 +55,7 @@ __all__ = [
     "aretry",
 ]
 
-__version__ = "0.3.4"
+try:
+    __version__ = version("commons")
+except PackageNotFoundError:
+    __version__ = "0.0.0+unknown"