ODC-184 support split and duplicated dims in gs_add_gating_method().

[djhammill]

@amcdavid adding PR here to implement features or fixes required by CytoExploreR please see https://ozette.atlassian.net/jira/software/c/projects/ODC/issues/ODC-184

This PR just makes it easier for users to interact with the gs_add_gating_method() API which currently expects dims to be supplied in a concatenated comma-separated string (i.e. "FSC-A,SSC-A") rather than the conventional c("FSC-A", "SSC-A") - both inputs will be supported after this change.

[amcdavid]

Is it OK if dims is more than 2-D?

[djhammill]

openCyto only supports 1D or 2D gating, but yes it will work with more than two dims.

[djhammill]

openCyto/R/csvTemplate-parser.R

Lines 291 to 296 in 323430e

	dim_count <- length(strsplit(split = ",", dims)[[1]])
	if (!dim_count %in% c(1, 2)) {
	if (!(dim_count == 0 && gm %in% c("polyFunctions", "boolGate", "refGate"))) {
	stop(popName, " has invalid number of dimensions: ", dim_count)
	}
	}

[djhammill]

I would love for us to support multiple dims (CytoExploreR uses a hacky way to get around this) but the issue is that the gating functions within openCyto don't perform a dims check so we'd need to update all of them to ensure that appropriate dimensions are supplied for each of the supported gating functions.

[djhammill]

We could possibly check the dims against the list of supported gating methods but that will have to be updated every time we add a new gating method.