Return shares deposited in depositCore

[PossibilityResult]

It'll also be extremely useful to return an array for shares deposited in depositCore.

This is because on autoswap the amount deposited is not actually the same as the amount credited to the depositor. Additionally, shares is what is used when withdrawing (not reserves).

Whether we have it in addition to amounts deposited or instead of, I have no opinion for.

[finkbeca]

We should be emitting this correctly within the emitted events, but not currently as a response. It should be easy to add this to a response.

[teddyknox]

@eljhfx can you include this change as part of your PR? Sounds like we're already emitting the correct event so idk if you even need that return value.