chore: Add schema related files to manifest (#2701)

Author: aahung

MANIFEST.in

@@ -5,6 +5,8 @@ recursive-include samtranslator/validator/sam_schema *.json
 include samtranslator/policy_templates_data/policy_templates.json
 include samtranslator/policy_templates_data/schema.json
 include samtranslator/model/connector_profiles/profiles.json
+include samtranslator/schema/docs.json
+include samtranslator/schema/schema.json
 include README.md
 include THIRD_PARTY_LICENSES