support postgres schema qualifier in queries (and type definitions)

[uladkasach]

we need to be able to support

  SELECT jobsdb.upsert_location(
    :city,
    :state,
    :postal,
    :country
  ) as id;

in addition to

  SELECT upsert_location(
    :city,
    :state,
    :postal,
    :country
  ) as id;

not everyone will want to update their search path - and depending on how they setup their db it could be useful to join cross schemas

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consider also:

• tables
• views
• functions

and

• in queries
• in ddl