Proto, storage: introduce "add" function for Carbonated_data_set_storage
Context
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
Checklist
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Document the interface of any function added or modified (see the coding guidelines) -
Document any change to the user interface, including configuration parameters (see node configuration) -
Provide automatic testing (see the testing guide). -
For new features and bug fixes, add an item in the appropriate changelog ( docs/protocols/alpha.rst
for the protocol and the environment, theDevelopment Version
section ofCHANGES.md
for everything else). -
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