Include Deposit Products endpoints

[NAlexPear]

In the dashboard, deposit product information for an org is populated from the /deposit-products and deposit-products/:id endpoints. Those are useful to callers, too, especially when handling account.updated events.

[Yaellever]

@NAlexPear I am not sure I understand the request. can you please specify what exactly is missing from the SDK? are you referring to this endpoint? https://docs.unit.co/deposit-accounts/#account-deposit-products

[NAlexPear]

@Yaellever no, it's a currently-undocumented route called /deposit-products, called internally by the dashboard to populate information about each deposit product. We can query that route just fine directly, but it would be nice to get a convenience method for that endpoint wrapped up in this client, too.