Provide one argument per parameter, or a single array #190

Currently a single array is provided to benchmarking methods with a @ParamProvider:

/**
 * @ParamProviders({"provideFoo"})
 */
public function benchFoo(array $params) 
{
    $x = $param['foo'];
    $y = $param['bar'];
}

We could expand the array keys to arguments as with PHPUnit:

/**
 * @ParamProviders({"provideFoo"})
 */
public function benchFoo($foo, $bar) 
{
}

Disadvantages:

• Slightly increased call time.
• Multiple parameter providers give a cartesian product, it would be difficult to anticipate the argument order (although we could enforce matching keys to argument names).