Port module for assigning consensus cell types from OpenScPCA-analysis

[allyhawkins]

We want to add a module for assigning consensus cell types to all ScPCA samples, using the consensus cell type reference that we created in OpenScPCA-analysis. We should use the same approach used in assign-consensus-celltypes.sh.

To complete this, we need to do the following:

• move the reference files to somewhere on S3 that can be used as input to this module.
• Port over the scripts, 03-save-coldata.R and 04-combine-celltypes.R
• write a workflow that has two processes, one for grabbing the colData and one for combining everything and assigning the consensus labels.