Impresso-pycommons reorganization

[piconti]

As mentioned in this issue, it was decided to separate the modules of impresso-commons into two:

• the rebuilder is added to text-acquisition
• some ot the remaining modules are reorganized and put into a new package when deemed useful to all: impresso-essentials.

This issue is thus for this second part of this restructuration, as described here.

• [x] utils.s3.py -> moved to a new io module, potentially merged with s3_delete.py.
• [x] utils.s3_delete.py -> moved to a new io module
• [x] utils.umia.py -> kept in current impresso_commons as legacy, moved to another repo if needed.
• [x] utils.utils.py -> kept as-is but as module and not as submodule
• [x] utils.dask_utils -> moved to new data_processing submodule, keeping only relevant functions
• [x] utils.config_loader.py -> removed
• [x] path.path_s3.py -> moved to new io module
• [x] path.path_fs.py -> moved to impresso-text-acquisition, keeping only relevant functions
• [x] images.img_utils.py -> kept in current impresso_commons as legacy, moved to another repo if needed.
• [x] images.olive_boxes.py -> kept in current impresso_commons as legacy, moved to another repo if needed.
• [x] classes.contentitem.py -> kept in current impresso_commons as legacy, moved to another repo if needed.
• [x] text.rebuilder.py -> moved to impresso-text-acquisition
• [x] text.helpers.py -> moved to impresso-text-acquisition
• [x] versioning.data_manifest.py -> kept as-is in a versioning module
• [x] versioning.data_statistics.py -> kept as-is in a versioning module
• [x] versioning.helpers.py-> kept as-is in a versioning module
• [x] versioning.compute_manifest.py -> kept as-is in a versioning module
• [x] schemas -> kept as-is

Potentially, other modules and submodules might be added, in a text submodules. These are modules hgihly reusable for text processing:

• text_utils.py
• tokenization_utils.py
• ner_utils.py to be added by @EmanuelaBoros.

In addition to these modifications, all the code needs to be

• [ ] documented
• [ ] tested
• [ ] published to pipy

[piconti]

Other tasks and things that are to do/were done as part of this migration:

• [ ] Move all relevant pycommons issues to essentials
• [x] update KNOWN_JOURNALS with the new titles, and make it a dict to include the origin partner of the title.
• [x] Add data, config and logs directories
• [x] Reinstantiate schemas as a git submodule
• [x] Perform small fixes to the manifests
  • Remove rebuilt-evenized as a data stage, since it's not used
  • fix the example config with push_to_git set to true, and set it to None by default when instantiating the manifest
  • move data aggregation functions from versioning.helpers to a new versioning.aggregators module.