Feature: implement federation of collections calls

[syphax-bouazzouni]

Context

This Pr is related to ontoportal/ontoportal-project#38; and implements the parallel call against multiple API. Please take a look at the tests for examples of usage.

Changes

• Add unit tests of the expected behavior of the federation (db35d02)
• Add caching debugging message option to see the cached and missed calls (9d5bb86)
• Update the initialization of the HTTP connection to have multiple by API (1daf74f)
• Create the RequestFederation module to implement federated_get function (63d00f0)
• Update collections calls to use federated_get() instead of get() (1161610)
• Update the special case of analytics to handle federated calls (f651f9f)

Benchmark

Portal name	Response time with no UI cache	Response time with UI cache	Results count
AgroPortal
https://data.agroportal.lirmm.fr	0.16290399990975857s	0.0006169998086988926s	1
https://data.agroportal.lirmm.fr/ontologies	0.3249760000035167s	0.13214100012555718s	185
https://data.agroportal.lirmm.fr/submissions	7.929086999967694s	2.010168000124395s	184
BioPortal
https://data.bioontology.org/	0.6429309998638928	0.0005680001340806484s	1
https://data.bioontology.org/ontologies	24.174467999953777s	0.7763689998537302s	1110
https://data.bioontology.org/submissions	22.10651999991387s	3.0445370003581047s	1031
EcoPortal
https://data.ecoportal.lifewatch.eu/	0.231649000197649s	0.292365999892354s	1
https://data.ecoportal.lifewatch.eu/ontologies	0.3730909996666014s	0.21255100006237626s	31
https://data.ecoportal.lifewatch.eu/submissions	3.1629160000011325s	1.7344190003350377s	27
EarthPortal
https://earthportal.eu:8443	0.13366000028327107s	0.6724610002711415s	1
https://data.earthportal.eu/ontologies	0.2508490001782775s	0.02595800021663308s	40
https://data.earthportal.eu/submissions	1.5953649999573827s	0.9168690000660717s	44
BiodviPortal
https://data.biodivportal.gfbio.org/	0.16592800011858344s	0.6727269999682903s	1
https://data.biodivportal.gfbio.org/ontologies	0.26030199974775314s	0.019911999814212322s	29
https://data.biodivportal.gfbio.org/submissions	1.074064000044018s	0.5119559997692704s	28
Federation
Federated Ontologies	26.728501999750733s	0.9789899997413158s	1210
Federation Submissions	36.02172500034794s	6.078201999887824s	1130
Total	50s	6s	1210