feat: Add functionality for bson::oid::ObjectId

[jordanvanallen]

Hey there,

New to open source PR's so please forgive any mistakes on my end.

On a project I'm currently working with we've been using FakeRS for testing. Our structs require ObjectId fields to operate due to MongoDB.

ObjectId's aren't deterministic due to their nature, so I'm not quite sure how to write a test for this.

I figured the best option would be to post what's currently working for me on a local branch I've been using and see if you folks are at all interested in this functionality being added or not before going any further.

[cksac]

maybe you can use from_bytes with faker generated bytes?
or if you don't need deterministic with random seed during test, you can use derive like below

#[derive(Debug, Dummy)]
struct Foo {
    #[dummy(default)]
    oid: ObjectId,
}

as ObjectId::default() will call ObjectId::new()

[jordanvanallen]

Fantastic idea!

That seems to have let me write a successful determinism test, which I've included as well.

I'm happy to add anything else as needed/required.

I really appreciate the help!