feat(EMS-4016): broker address lookup - data migration

[ttbarnes]

Introduction ✏️

This PR adds a data migration script so that when main-broker-address-lookup is deployed, we can migrate previous applications data structure into the new data structure required for "broker address lookup".

Resolution ✔️

• Create data migration V4 to V5 index script.
• Create migration helper functions.
• Update package.json.
• Update, align application VERSIONS constants.
  • NOTE: Whilst this migration is for version 5 - version 4 has been added.
  • In the near future, version 4 and 5 could be merged into one migration script.
  • Version 4 is currently in a different branch and could will be rolled out before version 5.
  • In the meantime, decided to keep version 5 separate.