Add update_all method

[aropie]

Overview

Currently, the only way for changes to be reflected in the Autocompleter is to remove_all, then store_all and remove_cache. This makes for a slow and inefficient process because most of the objects weren't really updated.

This PR introduces the method update_all, which in turn calls update_provider for each of the Autocompleter's provider. This method aims to significantly reduce the number of operations made on Redis by bulking them together as much as possible, as well as analyze the data in order to only deal with objects which were actually modified, leaving the rest untouched.
In order to do this, one of the main points was to add a new Redis hashmap djac.provider.sc which stores a mapping of obj_id -> score. This is done in order to have a reference to know when a given object has updated its score, since all objects use the same score across all the ranked sets.

I've tried documenting the method and the reasoning as much as possible, but I agree the whole implementation still feels bulky and somewhat convoluted. Any suggestions on making it leaner/more concise are very welcome

How to test

• New test cases make sense and pass

[coveralls]

Pull Request Test Coverage Report for Build 13312062270

Details

• 151 of 157 (96.18%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.8%) to 93.21%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
autocompleter/management/commands/autocompleter_init.py	2	4	50.0%
autocompleter/base.py	147	151	97.35%

Totals
Change from base Build 7672290461:	0.8%
Covered Lines:	961
Relevant Lines:	1031

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💛 - Coveralls