[WIP] Add new spatially dependent lorenz-forcing calibration comparison between methods

[odunbar]

Purpose

Close #424

To-do

• Include spin-up period in the statistics function: (i) Look at some trajectories of x(t) from prior, how long is the time-to-steady-state (make the spin up for each ensemble > 2*max of this) (ii) optional create a heatmap of these
• Initialization approach (for initial state condition) - may be redundant if we have a reasonable spin-up.
• Include RMSE calculation within the iteration loop: get_error(ekiobj) , apply sqrt and /sqrt(length(y))
• introduce break/continue in loop when RMSE < 1.

Content

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• I have read and checked the items on the review checklist.

[rgjini]

Work in progress (WIP)