feat: show LP tokens in add form details

[agualis]

Example use case:
Trying to see how much veBAL I would get depositing vs. swapping.

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[uiuxxx]

Looks good to me

[garethfuller]

Can you think of any cases where this might cause problems? e.g. if approvals have not been done? Is there not a case where simulations fail until approvals are in place?

[agualis]

Can you think of any cases where this might cause problems? e.g. if approvals have not been done? Is there not a case where simulations fail until approvals are in place?

Good point. I don't think we have that problem in add simulations.

However, I realised that pools requiring proportional inputs are not showing this LP tokens field as these pools do not display price impact details:

@garethfuller @uiuxxx Are you fine with this drawback? Or do you prefer to add a UI workaround/redesign this?

[garethfuller]

@agualis I think it's fine to leave this as it is for now. If this feature is needed on CoW pools we can do that in another PR when requested.