chore: make javadoc optional for building from a reduced-pom.xml
chore: make javadoc optional for building from a reduced-pom.xml

javadoc can be built with mvn -Pjavadoc ...

pgjdbc/pgjdbc,pgjdbc/pgjdbc,marschall/pgjdbc,sehrope/pgjdbc,marschall/pgjdbc,marschall/pgjdbc,pgjdbc/pgjdbc,jorsol/pgjdbc,sehrope/pgjdbc,davecramer/pgjdbc,pgjdbc/pgjdbc,sehrope/pgjdbc,jorsol/pgjdbc,jorsol/pgjdbc,jorsol/pgjdbc,davecramer/pgjdbc,davecramer/pgjdbc,marschall/pgjdbc,sehrope/pgjdbc,davecramer/pgjdbc