Fix embedding_valid dependency errors in executable modules

[dllllb]

python -m dltranz.pl_fit_target

Traceback (most recent call last):
File "/usr/lib/python3.8/runpy.py", line 192, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/usr/lib/python3.8/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/home/dmitri/pytorch-lifestream/dltranz/pl_fit_target.py", line 6, in
from dltranz.data_load.data_module.cls_data_module import ClsDataModuleTrain
File "/home/dmitri/pytorch-lifestream/dltranz/data_load/data_module/cls_data_module.py", line 7, in
from embeddings_validation.file_reader import TargetFile, ID_TYPE_MAPPING
ModuleNotFoundError: No module named 'embeddings_validation'