Add support for argument_specs attribute to RoleMetadata class (#73120)

changelogs/fragments/73120-rolemetadata-argspecs.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - Add support for `argument_specs` data in role metadata.

lib/ansible/playbook/role/metadata.py

@@ -42,6 +42,7 @@ class RoleMetadata(Base, CollectionSearch):
     _allow_duplicates = FieldAttribute(isa='bool', default=False)
     _dependencies = FieldAttribute(isa='list', default=list)
     _galaxy_info = FieldAttribute(isa='GalaxyInfo')
+    _argument_specs = FieldAttribute(isa='dict', default=dict)
 
     def __init__(self, owner=None):
         self._owner = owner

test/integration/targets/roles/roles/b/meta/main.yml

@@ -1,2 +1,4 @@
 dependencies:
     - name: a
+
+argument_specs: {}