Feat query gen 2.3

[stnguyen90]

Based on previous feedback:

• Feat: Query gen 2(.1) #157 (comment)
• Feat query gen 2.2 #162

This PR updates the Query class to be used like:

// signature of constructor is (string $method, string $attribute = '', array $values = [])
$query = new Query('equal', 'actors', ['Brad Pitt', 'Johnny Depp']);

$this->assertEquals('equal', $query->getMethod());
$this->assertEquals('actors', $query->getAttribute());
$this->assertEquals('Brad Pitt', $query->getValues()[0]);

// other examples
$query = new Query('lessThan', 'score', [10]);
$query = new Query('orderDesc', 'score');
$query = new Query('limit', values: [10]);

// static helper methods
$query = Query::equal('title', ['Iron Man']); // accepts array
$query = Query::greaterThan('score', 10); // value is not array
$query = Query::search('search', 'John Doe'); // also not array
$query = Query::orderAsc('score');
$query = Query::orderDesc(''); // empty string to sort on natural order
$query = Query::limit(10);
$query = Query::cursorAfter($cursorDocument); // takes a Document
$query = Query::contains('arrayAttribute', [1, 2, 3]); // accepts array

Update parsing of queries to be like:

$query = Query::parse('equal("actors", ["Brad Pitt", "Johnny Depp"])');

$this->assertEquals('equal', $query->getMethod());
$this->assertEquals('actors', $query->getAttribute());
$this->assertEquals("Brad Pitt", $query->getValues()[0]);
$this->assertEquals("Johnny Depp", $query->getValues()[1]);

$query = Query::parse('equal("actors", "Brad Pitt")');

$this->assertEquals('equal', $query->getMethod());
$this->assertEquals('actors', $query->getAttribute());
$this->assertEquals("Brad Pitt", $query->getValues()[0]);

In addition, this PR updates the Database find methods to only use queries (the Adapter's find method remains the same).

Finally, this PR also updates the Queries Validator to validate limit, offset, cursor, and order queries.

[eldadfux]

Added a few comments, I think we should be close to a merge :)