[Improvement] Support new columns type like UUID

[otoniel-isidoro]

The number of supported types of db columns is very limited. Should be possible at least specify a custom type by an extension point like withValueType(UUID.class) for example.

[otoniel-isidoro]

#16

[otoniel-isidoro]

For now I added the UUID type but I will try implement later a generic type to turn it possible to make assertions on any column type that is not mapped on assertj-db.

[otoniel-isidoro]

I will close this issue and open another one to generic column type assertions.