[12.x] Add makeMany method to Factory

[jackbayliss]

We can createMany, but cant makeMany,

This PR adds makeMany which is basically the same as createMany but calls make underneath.

Seemed an easy enough change and easy to maintain.

This is generally useful for assertions where we don't need the database.

// This works fine - and goes to the db
$tags = Tag::factory()->createMany([
    ['name' => 'I'],
    ['name' => 'Am'],
    ['name' => 'Fake'],
]); 

// No DB, but currently we do... 
$tags = Tag::factory()->forEachSequence(
    ['name' => 'I'],
    ['name' => 'Am'],
    ['name' => 'Fake'],
)->make();

// With this PR we unlock... 
$tags = Tag::factory()->makeMany([
    ['name' => 'I'],
    ['name' => 'Am'],
    ['name' => 'Fake'],
]);

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