sstable key: provide equality and inequality operator
sstable key: provide equality and inequality operator

So we don't have to convert to a bytes view unnecessarily.

Signed-off-by: Glauber Costa <f8b79557d19b40666ebe336545a0b6178af65685@cloudius-systems.com>
Reviewed-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@cloudius-systems.com>

dwdm/scylla,kangkot/scylla,justintung/scylla,shaunstanislaus/scylla,bowlofstew/scylla,phonkee/scylla,acbellini/scylla,respu/scylla,stamhe/scylla,eklitzke/scylla,senseb/scylla,victorbriz/scylla,avikivity/scylla,scylladb/scylla,raphaelsc/scylla,kangkot/scylla,phonkee/scylla,tempbottle/scylla,wildinto/scylla,duarten/scylla,eklitzke/scylla,wildinto/scylla,glommer/scylla,kjniemi/scylla,aruanruan/scylla,acbellini/scylla,scylladb/scylla,rluta/scylla,kangkot/scylla,gwicke/scylla,raphaelsc/scylla,respu/scylla,stamhe/scylla,wildinto/scylla,avikivity/scylla,acbellini/scylla,capturePointer/scylla,victorbriz/scylla,linearregression/scylla,rluta/scylla,linearregression/scylla,glommer/scylla,tempbottle/scylla,respu/scylla,asias/scylla,guiquanz/scylla,scylladb/scylla,asias/scylla,shaunstanislaus/scylla,phonkee/scylla,guiquanz/scylla,bowlofstew/scylla,kjniemi/scylla,gwicke/scylla,guiquanz/scylla,capturePointer/scylla,rentongzhang/scylla,rentongzhang/scylla,raphaelsc/scylla,duarten/scylla,asias/scylla,eklitzke/scylla,scylladb/scylla,rentongzhang/scylla,aruanruan/scylla,rluta/scylla,justintung/scylla,dwdm/scylla,linearregression/scylla,dwdm/scylla,shaunstanislaus/scylla,tempbottle/scylla,kjniemi/scylla,victorbriz/scylla,stamhe/scylla,bowlofstew/scylla,avikivity/scylla,aruanruan/scylla,justintung/scylla,capturePointer/scylla,senseb/scylla,duarten/scylla,senseb/scylla,glommer/scylla,gwicke/scylla