Composer: update for v2

Fluent: allow Db\Sql in distinctOn

DB: fix twice call fetch row mutator for fetchAll()

CS

Fluent: add DISCTINC ON

Fluent: MERGE - add RETURNING clause

DB: data type parser - fix parsing arrays with NULL values

DB: Row - fix unseralize

DB: fetch mutators - better PHPStan annotation for Closure

DB: add fetch mutators