ENH: Add datatypes and value classes to Extern C interface

Summary

See https://gitlab.indiscale.com/caosdb/customers/lfpb/management/-/issues/420. Adapts the

Focus

The single get_value functions are now split up into get_<datatype>_value, get_value_list_length, and get_<datatype>_list_value_at functions. Also, importances, roles, and datatypes are now cast from string to enums and back for getting and setting. In the case of datatypes, two additional Booleans for is_reference and is_list.

In addition, the way memory si allocated in case of char pointers has been fixed.

Test Environment

Unit tests and integration tests should be sufficient. Integration testing with deploy in f-grpc and server in f-grpc-f-consolidation, as usual.

Check List for the Author

Please, prepare your MR for a review. Be sure to write a summary and a focus and create gitlab comments for the reviewer. They should guide the reviewer through the changes, explain your changes and also point out open questions. For further good practices have a look at our review guidelines

• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

include/ccaosdb.h

@@ -332,10 +332,14 @@ int caosdb_entity_entity_get_int_value(caosdb_entity_entity *entity, long *out);
 int caosdb_entity_entity_get_double_value(caosdb_entity_entity *entity, double *out);
 int caosdb_entity_entity_get_boolean_value(caosdb_entity_entity *entity, bool *out);
 int caosdb_entity_entity_get_string_value(caosdb_entity_entity *entity, char **out);
-int caosdb_entity_entity_get_int_list_value(caosdb_entity_entity *entity, long *out);
-int caosdb_entity_entity_get_double_list_value(caosdb_entity_entity *entity, double *out);
-int caosdb_entity_entity_get_boolean_list_value(caosdb_entity_entity *entity, bool *out);
-int caosdb_entity_entity_get_string_list_value(caosdb_entity_entity *entity, char **out);
+int caosdb_entity_entity_get_int_list_value_at(caosdb_entity_entity *entity, long *out,
+                                               const int index);
+int caosdb_entity_entity_get_double_list_value_at(caosdb_entity_entity *entity, double *out,
+                                                  const int index);
+int caosdb_entity_entity_get_boolean_list_value_at(caosdb_entity_entity *entity, bool *out,
+                                                   const int index);
+int caosdb_entity_entity_get_string_list_value_at(caosdb_entity_entity *entity, char **out,
+                                                  const int index);
 int caosdb_entity_entity_get_value_list_length(caosdb_entity_entity *entity, int *out);
 
 int caosdb_entity_entity_get_version_id(caosdb_entity_entity *entity, char **out);
@@ -366,10 +370,14 @@ int caosdb_entity_property_get_int_value(caosdb_entity_property *property, long
 int caosdb_entity_property_get_double_value(caosdb_entity_property *property, double *out);
 int caosdb_entity_property_get_boolean_value(caosdb_entity_property *property, bool *out);
 int caosdb_entity_property_get_string_value(caosdb_entity_property *property, char **out);
-int caosdb_entity_property_get_int_list_value(caosdb_entity_property *property, long **out);
-int caosdb_entity_property_get_double_list_value(caosdb_entity_property *property, double *out);
-int caosdb_entity_property_get_boolean_list_value(caosdb_entity_property *property, bool *out);
-int caosdb_entity_property_get_string_list_value(caosdb_entity_property *property, char ***out);
+int caosdb_entity_property_get_int_list_value_at(caosdb_entity_property *property, long *out,
+                                                 const int index);
+int caosdb_entity_property_get_double_list_value_at(caosdb_entity_property *property, double *out,
+                                                    const int index);
+int caosdb_entity_property_get_boolean_list_value_at(caosdb_entity_property *property, bool *out,
+                                                     const int index);
+int caosdb_entity_property_get_string_list_value_at(caosdb_entity_property *property, char **out,
+                                                    const int index);
 int caosdb_entity_property_get_value_list_length(caosdb_entity_property *property, int *out);
 
 int caosdb_entity_parent_get_id(caosdb_entity_parent *parent, char **out);