taxonomy: dq_serving_size_parsing_improvements

[benbenben2]

What

Reviewed the Mirabelle results from the issue for serving size (see below)

Here are 100 examples randomly: http://mirabelle.openfoodfacts.org/products?sql=select+code%2C+url%2C+creator%2C+created_datetime%2C+last_modified_datetime%2C+product_name%2C+serving_size%2C+serving_quantity%0D%0Afrom+%5Ball%5D+%0D%0Awhere+%28serving_quantity+%3D%3D+%22%22+or+serving_quantity+IS+NULL%29+and+%28serving_size+%21%3D+%22%22%29%0D%0Aorder+by+random%28%29%0D%0Alimit+100

Brazil (pt:) added "gm". 5,484 rows
xx:onz, 128 rows
en:metric teaspoon 2 rows
note that beside metric teaspoon, teaspoon or tsp depends on the country (us, uk, canada)
same for cup and tbsp which is also a factor of the density (i.e., 1 tbsp of water will be different than 1 tbsp of sugar, for example)
gg instead of g is typo, not added in taxonomy. It has to be fixed by contributors.

Related issue(s) and discussion

• Related to Serving_quantity is wrongly computed based on serving_size #7768

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[stephanegigandet]

Thanks!