review branch

[EstebanMontandon]

This is a review branch of the d2d development.

Files to focus the review:

-extract.py
-push.py
-data_models.py
-Related tests.

Main changes on extract and push functionalities:

-Refactored to use polars instead of pandas
-Logging in extract and push uses a generic function from utils.
-DHIS2Extractor format the extracts following DHIS2 naming.
-DHIS2Pusher class expects an extract with DHIS2 naming (extract -> push).
-Push class classifies datapoints based on polars filtering on hard rules (faster).
-Serialization (import and remove payload) handled in the DataPointModel Class definition (data_models.py)
-Testing basic functionalities for : DHIS2Extractor , DHIS2Pusher and DataPointModel.

Next steps and ideas (No need to review these files):

-DHIS2Extractor uses three separate classes to handle data elements, reporting rates, and indicators. I've created a branch with an alternative approach that uses DHIS2's standard API endpoints (dataValueSets & Analytics) instead. This aligns better with DHIS2's architecture, but requires users to provide additional parameters when using Analytics data.
-OrgUnitModel class (data_models.py): needs a simplification.
-DHIS2Pusher class should be able to push OrgUnits for creation and update, so the org_unit_aligner can make use of it.
-DHIS2PyramidAligner (org_unit_aligner.py): Util class to handle the creation and update of DHIS2 pyramid (..implement DHIS2Pusher).
-DatasetCompletionSync (dataset_completion.py): Util class to retrieve and push dataset reporting statuses. Very slow as DHIS2 API does not allow updates in bulk. Needs a review.