Dev/cams solar radiation timeseries

[ecmwf-cobarzan]

Here is the list of modifications:

• refactor and factor in the CAMS-solar-radiation-timeseries adaptor (the initial purpose of this branch)
• cache avoidance logic (by adding a random key under normalise_request, as recommended by Mattia)
• call intersect constraints from the multi adaptor and CAMS-solar-radiation-timeseries adaptor (needed some data range support added to the intersect_constraint logic)

The cache avoidance and constraints intersection are triggered using configuration switches (off by default, so that the preexisting behaviour is preserved).