Feat: Add more funcitons to work with files

@ahmedk @kamile @tmichela

Corrections notebooks for modular detectors (e.g. AGIPD) uses functions, to create proper file lists to run over.

To prepare for refactoring I add two more functions for the same purpose.

Function gain_map_files2 is very similar to gain_map_files, but takes different input parameters.

Function map_modules_from_folder is similar to map_modules_from_files.

cal_tools/cal_tools/tools.py

@@ -100,7 +100,7 @@ def map_modules_from_folder(in_folder, run, path_template, karabo_da,
             sequences_qm, total_file_size)
 
 
-def gain_map_files2(in_folder, runs, path_template, karabo_da, sequences=None):
+def map_gain_stages(in_folder, runs, path_template, karabo_da, sequences=None):
     """
     Prepare queues of files to process.
     Queues are stored in dictionary with module name Q{}M{}