Customize the ObjectID in algolia

[oscarmorrison]

Related to:
#293
#297

Description

Currently (before using the scout-extended) library, our scout id / algolia object id looks like this:
modelname_id such as page_123 user_12 etc.

Now using the scout-extended our scoutids / object id look like:

"App\Models\Page::page_94312::99"
"App\Models\User::user_94312"

Ideally we would like to keep our models object id:

page_122
page_123::2 (with splits)