Changed session parameters to builder pattern

[zhenlineo]

The new builder pattern looks like:

SessionConfig config = SessionConfig.builder()
    .withDatabase( "neo4j" )
    .withDefaultAccessMode( AccessMode.WRITE )
    .withBookmarks( bookmark1, bookmark2 )
    .build();
try ( Session session = driver.session( config ) )
{}

A syntax sugar for database name is available:

try ( Session session = driver.session( SessionConfig.forDatabase( "neo4j" ) ) )
{}

[ali-ince]

LGTM.

I'm not merging this to leave the preferred timing to you (before or after the previous PR's).