Support specifying a subset of columns when copying data in modelardb_embedded #319
Description
Currently it is not possible to copy data from specific columns of a table to a new table. This is currently disallowed due to issues with checking that the schema of the data that is copied matches the table that the data is copied to.
When functionality to create tables if they do not already exist in copy and move is added in #318, this should also be considered when allowing a subset of columns.
Note that when copying the physical data to a new table with a different schema, there might be issues related to the field column indices saved in the physical data, since they might not match the indices in the new schema.