Add sqltyped version

Hi,

This pull request adds an implementation with sqltyped:

https://github.com/jonifreeman/sqltyped

It would be nice to see how it fares in this kind of benchmark. Please note that for sqltyped to work it needs the schema already at compile time. Sqltyped connects to the database at compile time to read database metadata which it uses to integrate SQL statements with Scala type system. Therefore the provided schema.sql script must be run before compilation:

sudo -u postgres psql databench < databench/databench-sqltyped/src/main/resources/schema.sql

My sbt-fu was not good enough to automate that step :)

Please let me know if I misunderstood some critical requirement and therefore didn't implement the benchmark correctly.

Cheers Joni