feat(api): find version using importlib.metadata

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2332>

api/funkwhale_api/__init__.py

@@ -1,7 +1,4 @@
-__version__ = "1.3.0-rc3"
-__version_info__ = tuple(
-    [
-        int(num) if num.isdigit() else num
-        for num in __version__.replace("-", ".", 1).split(".")
-    ]
-)
+from importlib.metadata import version as get_version
+
+version = get_version("funkwhale_api")
+__version__ = version

api/tests/test_init.py

@@ -0,0 +1,5 @@
+def test_version():
+    from funkwhale_api import __version__, version
+
+    assert isinstance(version, str)
+    assert version == __version__

changes/changelog.d/get-api-version-from-package.enhancement

@@ -0,0 +1 @@
+Get api version from python package