Add catalogue connector for REST API scheme

To be used with APIs such as DEFRA.

See:

• https://uk-air.defra.gov.uk/sos-ukair/static/doc/api-doc/#general-common-query-parameters
• https://uk-air.defra.gov.uk/sos-ukair/api/v1/stations/1345
• https://uk-air.defra.gov.uk/sos-ukair/api/v1/timeseries/3020