fix: Support importlib_metadata v5.0.0 (getredash#5840)

* fix: Support importlib_metadata v5.0.0

importlib_metadata removed compatibility shims for deprecated entry point interfaces.
see: https://github.com/python/importlib_metadata/blob/main/CHANGES.rst#v500

Filter result of entry_points function by group parameter.
see: https://importlib-metadata.readthedocs.io/en/latest/api.html#importlib_metadata.entry_points

* fix: Enable to run in older python version

In circleci frontend-unit-tests, old node image is used and python 3.5 is used.
Support both old version and latest version by checking ijmportlib_metadata version

bin/bundle-extensions

@@ -65,7 +65,18 @@ def load_bundles():
 
     """
     bundles = odict()
-    for entry_point in importlib_metadata.entry_points().get("redash.bundles", []):
+    # HACK:
+    #   bin/bundle-extensions is tested in different versions.
+    #   circleci frontend-unit-tests: python 3.5 and importlib-metadata-2.1.3
+    #   circleci backend-unit-tests: python 3.7 and importlib-metadata-5.0.0
+    if importlib_metadata.version("importlib_metadata") >= "5.0.0":
+        bundles_entry_points = importlib_metadata.entry_points(group="redash.bundles")
+    else:
+        bundles_entry_points = importlib_metadata.entry_points().get(
+            "redash.bundles", []
+        )
+
+    for entry_point in bundles_entry_points:
         logger.info('Loading Redash bundle "%s".', entry_point.name)
         module = entry_point_module(entry_point)
         # Try to get a list of bundle files

redash/extensions.py

@@ -27,7 +27,7 @@ def entry_point_loader(group_name, mapping, logger=None, *args, **kwargs):
     if logger is None:
         logger = extension_logger
 
-    for entry_point in entry_points().get(group_name, []):
+    for entry_point in entry_points(group=group_name):
         logger.info('Loading entry point "%s".', entry_point.name)
         try:
             # Then try to load the entry point (import and getattr)