result_set: fix deserialization of collection types
result_set: fix deserialization of collection types

Collection cells in query results are serialized using the "mutation form",
and must be deserialized using that format as well.

Fixes "--logger-log-level storage_proxy=trace" crasher.

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