Populate provider specific IDs from GOKb

From the package identifiers in the GOKb OAI-PMH XML (path: /record/metadata/gokb/package/identifiers/identifier) where the "type" attribute is specified and has the value "ttl_prv" in OAI-PMH, or the type attribute is empty, add the identifier to the package

• The value of the identifier should be taken from the 'value' attribute
• The namespace of the identifier should be constructed as follows:
  • gokb_ttl_prv_<<namespace>> (using the value of the namespace attribute, not including the '<<' or '>>')

There are currently examples of packages with identifiers in publisher specific namespaces in this XML:

https://gokbt.gbv.de/gokb/oai/index/packages?verb=listRecords&metadataPrefix=gokb&resumptionToken=%7C%7C72%7Cgokb

Example 1

OAI URL: https://gokb.org/gokb/oai/packages?verb=ListRecords&metadataPrefix=gokb&resumptionToken=||27|gokb

Package name: Neues Handbuch Hochschullehre
package id="878126" uuid="bad9dfdc-90f9-4b50-9d86-8708450dd044"
 

<identifiers>
  <identifier namespace="duz" namespaceName="" value="HHL" type="ttl_prv"/>
</identifiers>

Example 2

OAI URL: https://gokb.org/gokb/oai/packages?verb=ListRecords&metadataPrefix=gokb&resumptionToken=||39|gokb

Package name: Engineering eJournal Collection
package id="888912" uuid="2b242d17-2362-4f16-9f0e-8d794287610f"
 

<identifiers>
  <identifier namespace="emerald" namespaceName="" value="EENG" type="ttl_prv"/>
  <identifier namespace="isil" namespaceName="ISIL" value="ZDB-55-EJC" type=""/>
</identifiers>

 Dev task breakdown

Add a block similar to this:
https://github.com/folio-org/mod-agreements/blob/master/service/src/main/groovy/org/olf/kb/adapters/GOKbOAIAdapter.groovy#L323:L330