Proto, storage: introduce "add" function for Carbonated_data_set_storage

Merged David Turner requested to merge add-op into master


Add a "add" method to Carbonated_data_set_storage. Data_set_storage already has this, and it's inconvenient to have to check mem before calling init.

I haven't added any testing because !4276 (merged) has the test framework and isn't merged yet. But I manually tested it, and it works.

Manually testing the MR


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