Add GetDispositions request

[shanear]

Add a request that calls the new GetDispositions endpoint on the ClaimsService V5.

Here are example request/repsonses:

getDispositions(claimId)

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:v5="http://vbms.vba.va.gov/external/ClaimService/v5">
   <soapenv:Header/>
   <soapenv:Body>
      <v5:getDispositions>
         <v5:claimId>600097563</v5:claimId>
      </v5:getDispositions>
   </soapenv:Body>
</soapenv:Envelope>

Response Body getDispositions:

<env:Body wsu:Id="id-6" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
      <getDispositionsResponse xmlns="http://vbms.vba.va.gov/external/ClaimService/v5" xmlns:aw="http://vbms.vba.va.gov/cdm/award/v4" xmlns:claim="http://vbms.vba.va.gov/cdm/claim/v5" xmlns:com="http://vbms.vba.va.gov/cdm/common/v5" xmlns:doc="http://vbms.vba.va.gov/cdm/document/v5" xmlns:ns2="http://vbms.vba.va.gov/external/ClaimService/v5" xmlns:part="http://vbms.vba.va.gov/cdm/participant/v5">
         <ns2:dispositionAssociations claimId="600097563" contentionId="175506" disposition="Granted"/>
         <ns2:dispositionAssociations claimId="600097563" contentionId="167016" disposition="Granted"/>
         <ns2:dispositionAssociations claimId="600097563" contentionId="175513" disposition="DTA - Fed Recs"/>
         <ns2:dispositionAssociations claimId="600097563" contentionId="167015" disposition="DTA - PMRs"/>
      </getDispositionsResponse>
   </env:Body>

blocks https://github.com/department-of-veterans-affairs/caseflow/issues/6186

[leikkisa]

Colin is very interested in testing this. He is going to send us some file numbers, and we are going to create ratings on them. Then Colin will add the dispositions to the file numbers, and after that we'll be able to test this get dispositions end point.

[kahlouie]

Work is all done on the connect_vbms side and sitting in a pr (#196). Just waiting on UAT data to be populated to test against UAT.