DESCRIPTION: Adds support for distributed role-membership management
commands from the databases where Citus is not installed (`GRANT <role>
TO <role>`)
This PR also refactors the code-path that allows executing some of the
node-wide commands so that we use send deparsed query string to other
nodes instead of the `queryString` passed into utility hook.
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Co-authored-by: Onur Tirtir <onurcantirtir@gmail.com>
Gürkan İndibay