Completely revert "remove useless contructor" changes on Illuminate\Support\Fluent where it doesn't respect object that implements IteratorAggregate and ArrayIterator.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

* it should respect object that implements `IteratorAggregate` and `ArrayIterator`.
* it should respect if you extend Fluent and provide default `$attributes` (#5570).

Signed-off-by: crynobone <crynobone@gmail.com>