add_h5_transposed_matrix: Add a transposed version of a matrix to an .h5 file
In AllenInstitute/BarMixer: Hashed scRNA-seq demultiplexing for .h5 files

Useful for applications that need feature-indexed, rather than observation-indexed values.

add_h5_transposed_matrix(
  h5_file,
  in_target = "matrix",
  in_feature_names = "id",
  in_sample_names = "barcodes",
  out_target = paste0("transposed_", target)
)

`h5_file`	An existing .h5 file.
`in_target`	The name of the target matrix. Default is "matrix".
`in_feature_names`	The feature names to use in the transposed matrix. Default is "id".
`in_sample_names`	The observation names to use in the transposed matrix. Default is "barcodes".
`out_target`	The name of the output matrix to store. Default is "transposed_" prefixed to the in_target param (e.g. "transposed_matrix").