Reduce number of alias for tiles to a strict minimum

[benoit74]

Fix #78

Former logic:

• always store real data at dedupl/{self._dedupl_helper_path(dedup_id)}
• add aliases for each tile from tiles/{z}/{x}/{y}.pbf to proper dedupl/{self._dedupl_helper_path(dedup_id)}

New logic:

• add first tile found for a given data at its natural path tiles/{z}/{x}/{y}.pbf
• add an alias for next tile using same data to first tile found path

For https://farm.openzim.org/recipes/maps_en_monaco it should for instance allow to move from 4595 article entry + 5596 alias (10191 entries) to 4595 article entries + 1001 alias (5596 entries), i.e. 45% reduction.

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.20%. Comparing base (ae3866d) to head (517c2ef).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/maps2zim/processor.py	12.50%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
+ Coverage   32.14%   32.20%   +0.05%     
==========================================
  Files          11       11              
  Lines         983      975       -8     
  Branches      132      132              
==========================================
- Hits          316      314       -2     
+ Misses        656      650       -6     
  Partials       11       11              

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