Create event handler to update instance id to MARC bibliographic record

Motivation

to provide the ability of mod-record-storage to update instance id in the 999 field of marc record during the new data import process using mod-pubsub as transport

Steps

• add mod-srs registration as a subscriber on CREATED_INVENTORY_INSTANCE event to mod-pubsub
• implement endpoint to get an event with the result of instances saving
• implement a method to set the instance id to subfield "i" of field "999" of parsed record
• implement a method to set instance id to field "externalIdsHolder" of record model

Results

mod-record-storage receives saved instances and fills out instances id to corresponding parsed records