ENH: New functions getEnumNameFromValue() and getEnumValueFromName()

Summary

See title.

Focus

Do the new functions cover the use cases of higher-order client libraries?

Test Environment

make test, look into test_utility.cpp.

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 -> Please run clang-format on a more recent version than available here.
• Reference related Issues -> No explicit issue
• 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/caosdb/data_type.h

@@ -155,12 +155,26 @@ public:
   DataType(ProtoDataType *wrapped)
     : ProtoMessageWrapper<ProtoDataType>(wrapped) {}
   DataType() : ProtoMessageWrapper<ProtoDataType>() {}
-  DataType(AtomicDataType data_type) : DataType() {
-    this->wrapped->set_atomic_data_type(
-      static_cast<ProtoAtomicDataType>(data_type));
+  /**
+   * Create an AtomicDataType typed DataType.  For references, use the std::string constructor.
+   */
+  DataType(AtomicDataType data_type, bool list_type = false) : DataType() {
+    if (list_type) {
+      this->wrapped->mutable_list_data_type()->set_atomic_data_type
+        (static_cast<ProtoAtomicDataType>(data_type));
+    } else {
+      this->wrapped->set_atomic_data_type(static_cast<ProtoAtomicDataType>(data_type));
+    }
   }
-  DataType(const std::string &data_type) : DataType() {
-    this->wrapped->mutable_reference_data_type()->set_name(data_type);
+  /**
+   * Create a reference typed DataType.
+   */
+  DataType(const std::string &data_type, bool list_type = false) : DataType() {
+    if (list_type) {
+      this->wrapped->mutable_list_data_type()->mutable_reference_data_type()->set_name(data_type);
+    } else {
+      this->wrapped->mutable_reference_data_type()->set_name(data_type);
+    }
   }
   [[nodiscard]] inline auto IsAtomic() const noexcept -> bool {
     return this->wrapped->data_type_case() == DataTypeCase::kAtomicDataType;