Allow recursively referencing models to be analysed

[mvorisek]

Use dark magic to overcome natural recursion of recursively referenced models.

fix hardcoded HasOne type - https://github.com/atk4/data/blob/5.0.0/src/Reference/HasOne.php#L30

other examples are https://github.com/atk4/data/blob/5.0.0/tests/RandomTest.php#L70

## BC break - model init / persistence might be required earlier

HasOne cannot be traversed (via ->createTheirModel() or ->ref()) without persistence set. Newly, our field type is infered, and as their model needs to be created for that, persistence must be set early to make the their model initialized.

Also make sure parent::init() is called always as the first statement in all your Model::init() methods.

## BC break - possible infine recursion

As we now infer their field type in HasOne, recursive models must use the strictly the same seed.

If your code ends with infine recursion, you need to take an action. If not, there is no BC break.

If you define their model as ['model' => new TheirModel()], replace it with ['model' => [TheirModel::class]].

## BC break - persistence can be referenced forever (only for PHP 8.2 and lower)

WeakMap values do not participate in GC. If you do not reopen connections to DBs during (one request/script run), no action is needed.