(#21409) Ensure that create_resources acts the same as a resource decl

The previous implementation of create_resources duplicated most of the
logic of Puppet::Parser::AST::Resource, but had variations which meant
that it didn't actually behave the same. This lead to the possibility
that what should have been equivalent statements in the language did not
always result in the same catalog. This re-implements create_resources
to construct the AST that is needed to create the requested resources
and evaluate the resulting structure. This should only be able to
differ from actual resource declarations in the language if the
constructed AST is wrong.