Implement 00018 - Issue Release Endpoint

Approach:

• markReady call gets additional parameter: AUTO / MANUAL
• markReady returns a LINK instead of nothing
• said link and decision is stored in session or request
• when notary accepts - we look at this decision to either fire issuance or go to a new state "waiting_for_issuance_trigger"
• the link leads to a new endpoint which can either return 404 - or in case the correspondig session is in the new state, will trigger the issuance call

this state should be able to timeout since it comes from the external world

fyi @neil.crossley