pass the ThunkArg to the idGenerator function

[loursbourg]

While working on a global error handling reducer where i needed to generate a unique ID for each outgoing
request, there were cases where the url itself changes based some parameters so the final url looks something
like this:
https://...../users/${ID}/add-to-favorite
and if, say you want to spin a loader for a specific item in a list of let's say 10 paginated items, you will actually
need to somehow uniquely identify which request belongs to which item, but if you could pass the thunkArg to
the request generator function you can easily then generate requestIds based on it, so that when you call
the idGenerator with a given id, it produces a "hash-like" representation of it.

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[phryneas]

Sorry that I got back to this so late - I'm completely swamped at the moment.

This looks good - can you also add docs changes and a test maybe?

[loursbourg]

Done!

[phryneas]

Looks good :)