[12.x] Add data_map helper

[Seb33300]

This PR adds a new helper to the Collection helper. In addition to the existing data_set which is limited to set static data, this PR adds the data_map helper that can be used to map a callable using dot notation.

For example:

$data = [
    'company' => [
        'name' => 'Acme Corporation',
        'employees' => [
            ['name' => 'John Doe', 'age' => 30],
            ['name' => 'Jane Smith', 'age' => 25],
        ]
    ]
];

data_map($data, 'company.employees.*.age', fn ($old) => ++$old);

// Result
$data = [
    'company' => [
        'name' => 'Acme Corporation',
        'employees' => [
            ['name' => 'John Doe', 'age' => 31],
            ['name' => 'Jane Smith', 'age' => 26],
        ]
    ]
];

The callable can accept 2 params:

• $old : previous value or null if not defined
• $key : the key to the mapped item (eg: company.employees.0)

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!