[DBAL-264] Support for UIDs in PostgreSQL
[DBAL-264] Support for UIDs in PostgreSQL

Add getGuidExpression() to PostgreSqlPlatform so that UUID support
works properly

hason/dbal,vutung2311/dbal,zeroedin-bill/dbal,mariuz/dbal,deeky666/dbal,wuxu92/dbal,v-bartusevicius/dbal,v-bartusevicius/dbal,LionwareSolutions/dbal,kupishkis/dbal,lcobucci/dbal,bspeterson/dbal,DHager/dbal,kupishkis/dbal,AlexDpy/dbal,cassvail/dbal,mathroc/dbal,adrienbrault/dbal,vortgo/dbal,shivergard/dbal,easybiblabs/dbal,helicon-os/doctrine-dbal,PowerKiKi/dbal,deeky666/dbal,cassvail/dbal,vortgo/dbal,drieschel/dbal,PowerKiKi/dbal,mihai-stancu/doctrine-dbal,lafourchette/dbal,mikeSimonson/dbal,mihai-stancu/dbal,adrienbrault/dbal,BenMorel/dbal,easybiblabs/dbal,kimhemsoe/dbal,gencer/dbal,webonyx/dbal,webonyx/dbal,hason/dbal,DHager/dbal,mihai-stancu/dbal,doctrine/dbal,stchr/dbal,Tobion/dbal,vutung2311/dbal,doctrine/dbal,Tobion/dbal,zeroedin-bill/dbal,hason/dbal,mRoca/dbal,adrienbrault/dbal,mathroc/dbal,kupishkis/dbal,DataSyntax/dbal,arima-ryunosuke/dbal,sarcher/dbal,AlexDpy/dbal,shivergard/dbal,stof/dbal,arima-ryunosuke/dbal,gencer/dbal,PowerKiKi/dbal,mbeccati/dbal,LionwareSolutions/dbal,nfrignani/dbal,lcobucci/dbal,bspeterson/dbal,stof/dbal,DataSyntax/dbal,easybiblabs/dbal,janschoenherr/dbal,mariuz/dbal,lafourchette/dbal,mbeccati/dbal,arima-ryunosuke/dbal,mariuz/dbal,mihai-stancu/doctrine-dbal,tk-s/dbal,drieschel/dbal,LionwareSolutions/dbal,tk-s/dbal,mRoca/dbal,nfrignani/dbal,kimhemsoe/dbal,stchr/dbal,wuxu92/dbal,sarcher/dbal,webonyx/dbal,mikeSimonson/dbal,sarcher/dbal,BenMorel/dbal,janschoenherr/dbal,helicon-os/doctrine-dbal