Allow Dynamic Properties on PHP 8.2

[ghostwriter]

If accepted, this patch allows Mockery to add #[\AllowDynamicProperties] PHP Attribute to the mock classes it generates.

before:

class Mockery_Foo {
    // snip
}

after:

#[\AllowDynamicProperties]
class Mockery_Foo {
    // snip
}

[davedevelopment]

Might be able to take care of this in #1210