cql3: Convert STRING_LITERAL lexer rule to C++
cql3: Convert STRING_LITERAL lexer rule to C++

Note! I did not convert "pg-style string literals" (whatever those are)
because it's using Java-specific regex.

Signed-off-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@cloudius-systems.com>

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