Collections: support keys in crossJoin(...$arrays) method

[vanodevium]

Improve this method or add the brand new method (ex. crossJoinKeys) for support combinations with keys.

Example in php:

collect(['numbers' => [1, 2, 3], 'symbols' => ['!', '@', '#'], 'letters' => ['a', 'b', 'c']])->crossJoinKeys();

---

Example in JSON formatting

Input array:

{
    "numbers": [
        1,
        2,
        3
    ],
    "symbols": [
        "!",
        "@",
        "#"
    ],
    "letters": [
        "a",
        "b",
        "c"
    ]
}

Expected result:

[
    {
        "numbers": 1,
        "symbols": "!",
        "letters": "a"
    },
    {
        "numbers": 1,
        "symbols": "!",
        "letters": "b"
    },
    {
        "numbers": 1,
        "symbols": "!",
        "letters": "c"
    },
    {
        "numbers": 1,
        "symbols": "@",
        "letters": "a"
    },
    {
        "numbers": 1,
        "symbols": "@",
        "letters": "b"
    },
    {
        "numbers": 1,
        "symbols": "@",
        "letters": "c"
    },
    {
        "numbers": 1,
        "symbols": "#",
        "letters": "a"
    },
    {
        "numbers": 1,
        "symbols": "#",
        "letters": "b"
    },
    {
        "numbers": 1,
        "symbols": "#",
        "letters": "c"
    },
    {
        "numbers": 2,
        "symbols": "!",
        "letters": "a"
    },
    {
        "numbers": 2,
        "symbols": "!",
        "letters": "b"
    },
    {
        "numbers": 2,
        "symbols": "!",
        "letters": "c"
    },
    {
        "numbers": 2,
        "symbols": "@",
        "letters": "a"
    },
    {
        "numbers": 2,
        "symbols": "@",
        "letters": "b"
    },
    {
        "numbers": 2,
        "symbols": "@",
        "letters": "c"
    },
    {
        "numbers": 2,
        "symbols": "#",
        "letters": "a"
    },
    {
        "numbers": 2,
        "symbols": "#",
        "letters": "b"
    },
    {
        "numbers": 2,
        "symbols": "#",
        "letters": "c"
    },
    {
        "numbers": 3,
        "symbols": "!",
        "letters": "a"
    },
    {
        "numbers": 3,
        "symbols": "!",
        "letters": "b"
    },
    {
        "numbers": 3,
        "symbols": "!",
        "letters": "c"
    },
    {
        "numbers": 3,
        "symbols": "@",
        "letters": "a"
    },
    {
        "numbers": 3,
        "symbols": "@",
        "letters": "b"
    },
    {
        "numbers": 3,
        "symbols": "@",
        "letters": "c"
    },
    {
        "numbers": 3,
        "symbols": "#",
        "letters": "a"
    },
    {
        "numbers": 3,
        "symbols": "#",
        "letters": "b"
    },
    {
        "numbers": 3,
        "symbols": "#",
        "letters": "c"
    }
]