Add ability to provide AWS Session Token and Error on no files found #7
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What this PR does
Whilst trying out the CLI locally to check everything is wired up okay, I came up with an issue where if a year isn't available in UKCP18 data, the failure is non-obvious. Now we explicitly call out if there was no files found for the provided parameters.
Also modified the zarr and docstore S3FS usages to allow for optional AWS Session Tokens, given we have to use them and it's hardcoded eventually in the implementation for passing in credentials.