[AArch64][SME]: Generate streaming-compatible code for int-minmax, fp-minmax

1-To generate code compatible to streaming mode:
 - enable custom lowering for SMIN, SMAX, UMIN, UMAX,
   FMAXNUM, FMINNUM, FMAXIMUM, FMINIMUM.
2-Testing files:
 - int-minmax.ll
 - fp-minmax.ll

Reviewed By: david-arm, sdesmalen

Differential Revision: https://reviews.llvm.org/D138292