Implement PHP Driver and Client

[Maytch]

Implemented AGTypeParse to parse results from PHP PostgreSQL fetch functions
Implemented AgeClient wrapper for PHP PostgreSQL Functions https://www.php.net/manual/en/ref.pgsql.php

AgeClient includes basic DIY query method:

$this->ageClient->query("
    SELECT * FROM cypher('$graphName', $$
        CREATE
            (a:Part {part_num: '123'}),
            (b:Part {part_num: '345'}),
            (c:Part {part_num: '456'}),
            (d:Part {part_num: '789'})
    $$) as (a agtype);
");

$results = $this->ageClient->query("
    SELECT * FROM cypher('$graphName', $$
        MATCH
            (a:Part)
        RETURN a
    $$) as (a agtype);
")->fetchAll();

And a Cypher-specific prepared statement method to remove PostgreSQL statement clutter and might prevent potential injections:

$this->ageClient->cypherQuery($graphName, 0, "
    CREATE
        (a:Person {name: \$p1}),
        (b:Person {name: \$p2}),
        (a)-[:KNOWS]->(b)
",[
    'p1' => 'Steven',
    'p2' => 'Mary'
]);

$results = $this->ageClient->cypherQuery($graphName, 3, "
    MATCH
        (a:Person {name: \$p1})-[r]-(b)
    RETURN *
",[
    'p1' => 'Steven'
])->fetchRow();