Add ability to add version to the calibration filepath.

What?

This MR makes it possible to specify the calibration version which should be used when returning calibration undertainty envelopes, with a new setting, calibration version, which should be added to the blueprint in order to specify the version explicitly. If the version is not specified it will default to v1 in order to maintain backwards compatibility.

Why?

The final versions of the calibration data will be provided in a directory structure slightly different from what was initially anticipated, so this change is required to allow asimov to find the files.

Who?

This MR was prepared by @daniel-williams.