[WIP] add tool to test new categorization

[RignonNoel]

This PR aim to implement a developer tool to help test new categorizations of ingredients.

After some personal investigation on the source code I deduced that the technical debt would be the biggest challenge to overcome in this PR and that it would be impossible to refactor the actual code without breaking a lot of things, loosing complete certitude into the results since the test coverage and quality is really poor:

• View doesn't follow good practice of Django and contain a lot of added feature without refactor of the architecture
• Some part of the code use direct SQL query
• There are multiple M2M relationship without related_name
• There are custom class of logic but the test are poor and there are no overall documentation to begin with

I tought the best would be to create a system of export/import that help us to change the system state and check generated KitchenCount. This way offer multiple pro:

1. We will be able to generate the KitchenCount without changing the actual code
2. We will have a system of export allowing us to analyse our state when needed
3. The import system will allow us to easily test multiple categorization system during our decision phase

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Actual state:

• Export of the template (list of ingredients and categorization)
• Detection of the new categories and link with actual ingredients
• Check to detect best categorization for every existing client
• Statistics to help evaluate the new categorization system
• Erase old category and write new one
• Automatic generation of the KitchenCount
• Rollback state of DB after the generation

[RignonNoel]

Here is an example of the actual output on the commandline:

[guillaumep]

Suggestion: add a link in the django admin panel to download the CSV generated by the export_template_new_categorization command (name it "Download ingredients categorization" for example).

[RignonNoel]

Work put on hold for the moment, Will wait for Santropol go before putting some work on it.