Emit a "CreateAmounts" struct instead of individual params in the create events

[PaulRBerg]

After implementing #207 and #208 , I have struggled to find a good order for the parameters of the create events. Even as they are today, I don't like it much.

Then, there is the perennial StackTooDeep issue that we need to be wary of.

Emitting a single CreateAmounts struct instead of netDepositAmount, protocolFeeAmount, and operatorFeeAmount`, would address both of the concerns above.

[andreivladbrg]

Emitting a single CreateAmounts struct

Sounds good

[PaulRBerg]

Thanks, @andreivladbrg.