Load a BED file and validate required columns
plc_load_bed_file_wt_header.RdThis function reads a BED file into a `data.table` and verifies that it includes the necessary columns for downstream processing. By default, it checks for the presence of 'chrom', 'chromStart', 'chromEnd', 'strand', and 'score'. If `sum_count = TRUE`, it also requires the 'sum_count' column.