[CALR-28] Load ASFIS reference dataset enriched with ISSCAAP groups at app starting

[eblondel]

Issue migrated from JIRA: https://sdlc.review.fao.org/jira/browse/CALR-28
Creator/Reporter: Emmanuel Blondel @eblondel
Assignee: Alexandre Bennici @abennici
Priority: Medium
Status: Done
Date of creation: 2021-11-25T15:59:52.000+0000

Follow logic of loadLocalCountryDatasets, and develop loadRemoteReferenceDatasets, referenced in data_access_utils.R invoked in global.R; in which we will load the ASFIS species classification enriched with ISSCAAP groups, as R global object available to all modules.

To get a named remotely fetched dataset, do a getRemoteReferenceDataset function in data_access_utils.R.