Format CellChat CCI results

Usage

format_cellchat(
  input_interactions,
  ref_db = "data/interactions_db/ref_db.rds",
  output_dir = ".",
  sample_id = NULL
)

input_interactions: path to file with the inferred interactions from CellChat (output file generated by run_cellchat()) (rds file)
ref_db: Path to interactions database (default = "data/interactions_db/ref_db.rds")
output_dir: output directory for saving output (default = '.')
sample_id: sample id to use for saving formatted CCI results (default = NULL; will determine sample id based on 'input_interactions' for this input_interactions has to be of the format 'cellchat__sample_id.rds')