[SveEmitter] Add builtins for Int & FP reductions

This patch adds integer builtins for:
- svaddv, svandv, sveorv,
  svmaxv, svminv, svorv.

And FP builtins for:
- svadda, svaddv, svmaxv, svmaxnmv,
  svminv, svminnmv