feat: Remove matcher predictor completely

[raphael0202]

Remove completely the matcher predictor from code. I also removed SpaCy dependency as we don't need it anymore.
Furthermore, we now clear all ingredient processing cache after calling neural model in the API, which reduces memory consumption.

[codecov]

Codecov Report

Merging #1253 (5b95045) into main (dac8e22) will decrease coverage by 0.14%.
The diff coverage is 58.33%.

@@            Coverage Diff             @@
##             main    #1253      +/-   ##
==========================================
- Coverage   56.59%   56.45%   -0.14%     
==========================================
  Files          79       78       -1     
  Lines        8116     7935     -181     
==========================================
- Hits         4593     4480     -113     
+ Misses       3523     3455      -68     

Files Changed	Coverage Δ
robotoff/app/api.py	48.16% <ø> (+0.39%)	⬆️
robotoff/app/schema.py	100.00% <ø> (ø)
robotoff/insights/importer.py	83.35% <ø> (ø)
robotoff/prediction/category/__init__.py	57.14% <0.00%> (+25.56%)	⬆️
.../prediction/category/neural/category_classifier.py	82.92% <ø> (ø)
robotoff/settings.py	91.94% <ø> (-0.16%)	⬇️
robotoff/utils/text/__init__.py	100.00% <ø> (+6.25%)	⬆️
...ral/keras_category_classifier_3_0/preprocessing.py	84.48% <33.33%> (-1.36%)	⬇️
...y/neural/keras_category_classifier_3_0/__init__.py	73.45% <50.00%> (-0.30%)	⬇️
robotoff/prediction/ocr/product_weight.py	81.96% <100.00%> (+0.45%)	⬆️
... and 1 more

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