Handle events for transfer module

[DimitrisJim]

As mentioned in a todo:

ibc-go/modules/apps/transfer/v2/keeper/keeper.go

Lines 78 to 79 in a5b69ec

	// TODO: events
	// events.EmitTransferEvent(ctx, sender.String(), receiver, tokens, memo, hops)

Potentially needed in other places too, should be double checked.

possibly blocked on these being spec'ed out too as was done for core.

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[Sruthi2357]

Shall I work on this? @DimitrisJim

[gjermundgaraba]

Shall I work on this? @DimitrisJim

Thank you for the interest, @Sruthi2357, but we will take this in the team as it requires some more discussion and possible spec input before we can complete it.