Improve input variable handling
At the moment, all metadata is for input variables is replicated every time an index uses this input variable. Given that we only use a couple of different input variables, such as tas
, pr
, tasmin
, and tasmax
, this duplication of metadata like cell methods and standard names is unnecessary.
To better deal with input variables and prepare for future extensions, we should add a new, separate registry of input variables and only refer to that where we need the input variables in the indices.