[SveEmitter] Add builtins for SVE2 Optional extensions (AES, SHA3, SM4, BITPERM)

This patch adds various builtins under their corresponding feature macros:

Defined under __ARM_FEATURE_SVE2_AES:
- svaesd
- svaese
- svaesimc
- svaesmc
- svpmullb_pair
- svpmullt_pair

Defined under __ARM_FEATURE_SVE2_SHA3:
- svrax1

Defined under __ARM_FEATURE_SVE2_SM4:
- svsm4e
- svsm4ekey

Defined under __ARM_FEATURE_SVE2_BITPERM:
- svbdep
- svbext
- svbgrp