Add retirement reason and include in retire event

[ryanchristo]

Summary

In the current implementation, we have a reason field for MsgCancel that is not stored in state but included in EventCancel but we do not have a reason field for MsgRetire.

In the past, we have used the transaction memo field for retirement reason but we should create a reason field for MsgRetire that is not stored in state but included in EventRetire (same as MsgCancel/EventCancel).

Problem Definition

Users must use the memo field of a transaction to provide a retirement reason but may want to use the memo field for something else or would rather use an explicit field for retirement reason.

Proposal

Add reason to MsgRetire that is not stored in state but included in EventRetire.

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[ryanchristo]

A reason field would also need to be added to MsgCreateBatch and MsgSend in the ecocredit module and MsgBuyDirect within the marketplace submodule and MsgTake within the basket submodule.