Implement fast SQL export (COPY/LOAD)

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Overview

We have a plan to use COPY/LOAD when our SQL plugin is finished - https://github.com/frictionlessdata/frictionless-py/issues/405 - but, currently, out Storage API is an object of possible improvements so it might make sense to prototype fast SQL export separately first.

I would just create a unofficial action like resource.copy_to_sql with a limited scope, test it, and then we will move it to the SQL plugin.