Fix distribution name normalization (PEP-0503)

Current logic in `test_installed_modules` does not properly handle
distributions with underscores. On my machine I get the following error
while running tests:
```
tests/integrations/modules/test_modules.py:60: in test_installed_modules
    assert installed_modules == pkg_resources_modules
E   AssertionError: assert {'aiven-clien...'22.2.0', ...} == {'aiven-clien...'22.2.0', ...}
E     Omitting 93 identical items, use -vv to show
E     Left contains 1 more item:
E     {'tomli_w': '1.0.0'}
E     Right contains 1 more item:
E     {'tomli-w': '1.0.0'}
E     Use -v to get more diff
```

This change fixes distribution name normalization by applying the code
from PEP-0503 (https://peps.python.org/pep-0503/#normalized-names).

Author: Roman Inflianskas

tests/integrations/modules/test_modules.py

@@ -1,3 +1,4 @@
+import re
 import sentry_sdk
 
 from sentry_sdk.integrations.modules import (
@@ -7,6 +8,17 @@
 )
 
 
+def _normalize_distribution_name(name):
+    # type: (str) -> str
+    """Normalize distribution name according to PEP-0503.
+
+    See:
+    https://peps.python.org/pep-0503/#normalized-names
+    for more details.
+    """
+    return re.sub(r"[-_.]+", "-", name).lower()
+
+
 def test_basic(sentry_init, capture_events):
     sentry_init(integrations=[ModulesIntegration()])
     events = capture_events()
@@ -33,28 +45,21 @@ def test_installed_modules():
     except ImportError:
         pkg_resources_available = False
 
-    installed_modules = _get_installed_modules()
-
-    # This one package is reported differently by importlib
-    # and pkg_resources, but we don't really care, so let's
-    # just ignore it
-    installed_modules.pop("typing-extensions", None)
-    installed_modules.pop("typing_extensions", None)
+    installed_distributions = {
+        _normalize_distribution_name(dist): version
+        for dist, version in _get_installed_modules().items()
+    }
 
     if importlib_available:
-        importlib_modules = {
-            _normalize_module_name(dist.metadata["Name"]): version(
-                dist.metadata["Name"]
-            )
+        importlib_distributions = {
+            _normalize_distribution_name(dist.metadata["Name"]): version(dist.metadata["Name"])
             for dist in distributions()
         }
-        importlib_modules.pop("typing-extensions", None)
-        assert installed_modules == importlib_modules
+        assert installed_distributions == importlib_distributions
 
     if pkg_resources_available:
         pkg_resources_modules = {
-            _normalize_module_name(dist.key): dist.version
+            _normalize_distribution_name(dist.key): dist.version
             for dist in pkg_resources.working_set
         }
-        pkg_resources_modules.pop("typing-extensions", None)
-        assert installed_modules == pkg_resources_modules
+        assert installed_distributions == pkg_resources_modules