feat(mojaloop/#2704): core-services support for non-breaking backward…

… api compatibility (#66)

feat(mojaloop/[#2704](https://github.com/mdebarros/ml-api-adapter/issues/2704)): core-services support for non-breaking backward api compatibility - mojaloop/project#2704
- added new feature_test: collections/hub/golden_path/feature_tests/backward_compatibility/fspiop_protocol_validation.json which asserts validations against correct current, old and not-supported versions for parties, quotes, transfers, and transactionRequests
- added new feature_test: collections/hub/other_tests/bulk_transfers/fspiop_protocol_validation.json which asserts validations against correct current, old and not-supported versions for bulkTransfers

These are a sub-set of tests as a result of the following investigatory issue: mojaloop/project#2660