[Flang][OpenMP] Added TODO checks for unsupported map types

This patch adds TODO checks for unspported types in the map clause for OpenMP Target directives.

Example of unsupported code:

implicit none
character(len=10) :: str1, str2(5,5)

type t
  character(len=10) :: str1, str2(5,5)
end type t
type(t) :: v

!$omp target enter data map(to: str2(2,5))
!$omp target enter data map(to: v%str1)
!$omp target enter data map(to: v%str2)
!$omp target enter data map(to: v%str2(1,2))

end

Differential Revision: https://reviews.llvm.org/D146292