Provide a request / a statement object in noSQL API

[Totktonada]

The alternative Java connector has ability to, say, construct update statement step-by-step. This can be more intuitive then our way.

Don't sure whether it worth to do so, looks as the minor improvement.

[rybakit]

For the record, the alternative PHP connector has this feature as well. It has the Operations class for update requests and Criteria for selects. Here are a few examples:

$result1 = $space->select(Criteria::key([1]));
$result2 = $space->select(Criteria::index('secondary')
    ->andKey(['bar'])
    ->andLimit(2)
    ->andOffset(1)
);

$result = $space->update([2], Operations::add(1, 5)->andSet(2, 'BAR'));