Rewrite read-bioinfo metadata module

[svarona]

PR #367 made some repetitive changes on the code to fix urgent issues.

The problem with the code is that the first step of the module is to divide the bioinformatic results by COD and process that data with the specific functions on the pipeline's config:

relecov-tools/relecov_tools/read_bioinfo_metadata.py

Line 794 in 2d1f7a0

for batch_dir, batch_dict in data_by_batch.items():

The order should be to process the data before splitting it, save that data into the output directory, and then split it by COD, because else, the splitted files and the original files are being processed twice with the same code.