Support ingesting data from the UK Met office.

Our internal users want access to historical meteorological data from the UK Met office. Let's see if we can adapt the `weather-dl` interface to request data from the UK Met office.

## Implementation Notes
This task is a bit ambiguous, since I (@alxmrs) don't know how the UK Met office structures its historical data. Thus, the first step of this process is to write a design doc that (1) investigates what data is available from this institution and (2) proposes how we can use the weather tools to ingest this data.

After a quick search, this seems like a useful place to start looking: https://www.metoffice.gov.uk/services/data