db: change read_collection_value() to return a bytes_view
db: change read_collection_value() to return a bytes_view

Faster, and useful with further transforms that return a view.

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