Fortran: Add F2018 TEAM_NUMBER to coindexed expressions [PR98903]

Add missing parsing and code generation for a[..., TEAM_NUMBER=...] as
defined from F2015 onwards.  Because F2015 is not used as dedicated
standard in GFortran add it to the F2018 standard feature set.

	PR fortran/98903

gcc/fortran/ChangeLog:

	* array.cc (gfc_copy_array_ref): Copy team, team_type and stat.
	(match_team_or_stat): Match a single team(_number)= or stat=.
	(gfc_match_array_ref): Add switching to image_selector_parsing
	and error handling when indices come after named arguments.
	* coarray.cc (move_coarray_ref): Move also team_type.
	* expr.cc (gfc_free_ref_list): Free team and stat expression.
	(gfc_find_team_co): Find team or team_number in array-ref.
	* gfortran.h (enum gfc_array_ref_team_type): New enum to
	distinguish unset, team or team_number expression.
	(gfc_find_team_co): Default searching to team= expressions.
	* resolve.cc (resolve_array_ref): Check for type correctness of
	team(_number) and stats in coindices.
	* trans-array.cc (gfc_conv_array_ref): Ensure stat is cleared
	when fcoarray=single is used.
	* trans-intrinsic.cc (conv_stat_and_team): Including team_number
	in conversion.
	(gfc_conv_intrinsic_caf_get): Propagate team_number to ABI
	routine.
	(conv_caf_send_to_remote): Same.
	(conv_caf_sendget): Same.

gcc/testsuite/ChangeLog:

	* gfortran.dg/coarray/coindexed_2.f90: New test.
	* gfortran.dg/coarray/coindexed_3.f08: New test.
	* gfortran.dg/coarray/coindexed_4.f08: New test.

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