[IMPC Web API] Generate the supporting data for the different IMPC API microservices from the ETL

[ficolo]

• [x] Gene Summary Service
• [x] Gene Phenotype Hits Service
• [x] Gene Stats results service
• [x] Gene Gauges averages JSON file
• [x] Gene Expression data service
• [x] Gene Images Service
• [x] Gene Diseases Service
• [x] Gene Publications service
• [x] Gene Order Service
• [ ] Allele Products Service

[rwilson-ebi]

Closed this ticket as a separate ticket exists to describe the work to produce data on the allele products