fix: Update module alias to resolve naming conflict (#820)

In the current design, the first character of each package is used to create an alias. I'd like to append the first character before underscores in the package name to further reduce conflicts.

Previously google.appengine_admin would have an alias prefix of ga. With this change, the alias prefix will be gaa.

Fixes: #819

Author: parthea

gapic/schema/metadata.py

@@ -115,9 +115,12 @@ def module_alias(self) -> str:
             return '_'.join(
                 (
                     ''.join(
-                        i[0]
-                        for i in self.package
-                        if i != self.api_naming.version
+                        [
+                            partial_name[0]
+                            for i in self.package
+                            for partial_name in i.split("_")
+                            if i != self.api_naming.version
+                        ]
                     ),
                     self.module,
                 )

tests/unit/schema/test_metadata.py

@@ -184,6 +184,14 @@ def test_address_name_builtin_keyword():
     )
     assert addr_kword.module_alias == "gp_class"
 
+    addr_kword = metadata.Address(
+        name="Class",
+        module="class",
+        package=("google", "appengine_admin"),
+        api_naming=naming.NewNaming(proto_package="foo.bar.baz.v1"),
+    )
+    assert addr_kword.module_alias == "gaa_class"
+
 
 def test_doc_nothing():
     meta = metadata.Metadata()