rvp: add packed instructions for rv32 - part1
add the following categories
* packed add/sub/pli instructions
* packed cross instructions
* packed absolute instructions
* packed accumulation instructions
* packed sign-extend and saturating instructions
* packed shift instructions
* packed compare instructions
* packed pack instructions
* packed basic arithmetic and data-move
* packed multiply instructions
* packed accumulate instructions
* packed multiply-add instructions
* RD-only element-wise register-pair
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Jason