res_sorcery_memory_cache: Add basic module implementation.

This change adds a basic res_sorcery_memory_cache module which implements
configuration option parsing, configuration file parsing for threading,
sorcery interface implementation, and unit tests.

Objects can be added, updated, deleted, and retrieved from the memory
cache. Automatic expiration and stale handling will be added in the
future.

Note that unit tests exist within the module itself in case the
threading done as a result of expiration results in asynchronous
actions (which it likely will). Providing access and a notification
mechanism for an external test module would be complicated and
not worth it.

ASTERISK-25067 #close
Reported by: Matt Jordan

Change-Id: Id8a6a357ef5a83d466f81eee56a67d13eeb118b9

include/asterisk/sorcery.h

@@ -1279,6 +1279,15 @@ struct ast_sorcery_object_type *ast_sorcery_get_object_type(const struct ast_sor
 int ast_sorcery_is_object_field_registered(const struct ast_sorcery_object_type *object_type,
 		const char *field_name);
 
+/*!
+ * \brief Get the module that has opened the provided sorcery instance.
+ *
+ * \param sorcery The sorcery instance
+ *
+ * \return The module
+ */
+const char *ast_sorcery_get_module(const struct ast_sorcery *sorcery);
+
 #if defined(__cplusplus) || defined(c_plusplus)
 }
 #endif

main/sorcery.c

@@ -2328,3 +2328,8 @@ int ast_sorcery_is_object_field_registered(const struct ast_sorcery_object_type
 	ao2_cleanup(object_field);
 	return res;
 }
+
+const char *ast_sorcery_get_module(const struct ast_sorcery *sorcery)
+{
+	return sorcery->module_name;
+}