build: Rename package to 'plugin_azure_cost_mgmt_cost_datasource' (PEP 625 compliance)

Signed-off-by: HanHyung Lee <167288002+lhhyung@users.noreply.github.com>

Author: lhhyung

src/setup.py

@@ -21,7 +21,7 @@
     f.close()
 
 setup(
-    name="plugin-azure-cost-mgmt-cost-datasource",
+    name="plugin_azure_cost_mgmt_cost_datasource",
     version=VERSION,
     description="Data source plugin for Azure Cost Management",
     long_description="",