cubicweb #17218476 store selected variables for rql queries in rset [done]

By storing the name of the selected variables for RQL select queries in the ResultSet, it should be possible to leverage this information to output symbolic bindings for RQL queries when requested by certain protocol, e.g. rqlio.

For example, the query Any X WHERE X is CWEtype could be answered with [{'X': 101}, {'X': 102}, {'X': 103}, ...] instead of [[101], [102], [103], ...]

This could, in turn, help clarify some client code for complex queries with many selected variables.

done in3.28.0
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