Implement statistical codes for Users

Statistical codes is implemented with following structure in mod-user-storage:

{ "statisticalCodes": {
"type": "array",
"items": {
"type": "object",
"properties": {
"statisticalCodeTypeId": {
"type": "string"
},
"code": {
"type": "string"
}
}
}
}

Where statisticalCodeTypeId is referring to a table with code types.

And in the wire-frame:

Where the cataloger choose a code type and then write the code free-text.

This design may undergo some changes.