Update registry-mgr-elastic to support new LDD JSON version information

[jordanpadams]

With LDDTool 13+, the way versions are specified within LDDs has changed. We need to update registry-mgr-elastic to support both. For the newer methodology, we should use some combination of IM Version + LDD Version instead of date (if it isn't too much effort)

Old:

[
  {
    "dataDictionary": {
      "Title": "PDS4 Data Dictionary" ,
      "Version": "1.13.0.0" ,
...

New:

[
  {
    "dataDictionary": {
      "Title": "PDS4 Data Dictionary" ,
      "IM Version": "1.13.0.0" ,
      "LDD Version": "1.5.0.0" ,

[jordanpadams]

Closed per #28