Derive effective model of dependencies and integrate into RAIL creation package

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..., possibly extending it to make it position-dependent.

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16/JUN/22

• this work cannot yet be undertaken and so will be on hold until more is known about the dependencies
• whilst infrastructure can be built, there is a lack of data
• this work is likely to be on hold in the next quarter (Jul-Sep'22).

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28/JUL/22

• this depends on the recipient group view of the results on the Y1 data (see #16). Since there is little effect, it is likely that this work will not need to be factored in after all.

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11/AUG/22

• @hangqianjun believes there is no easy mitigation so will likely include the effect of observing conditions into the RAIL degrader
• the proposed work in this ticket is therefore likely to no longer be necessary.
• Need confirmation of this from @joachimi before closing the ticket.

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15/SEP/22

• @joachimi confirmed this can be closed.