feat: start of additives panels

[stephanegigandet]

Functional:

• list additives after the list of ingredients, as a list of small panels
• clicking on the additive name opens the additive panel
• additive panel currently consists only of the Wikipedia abstract and link (which are of very different levels of quality and relevance to food products depending on additive and language)
• to be added: a list of the additive functions (colours, raising agent etc.)
• to be added: EFSA table for the risk of overexposure (+ corresponding colors/icons in the list of additives)

Knowledge panel API changes:

• added a size="small" property to panels, so that the list of additives doesn't take a huge amount of vertical space
• added source_text / source_url / source_language to panel text elements

[alexgarel]

LGTM

[alexgarel]

When there is more than 3 or 4 arguments, shouldn't we use hash to pass arguments ?

I feel like this could help make the code a bit more readable (where we call such functions).

[stephanegigandet]

If we use a hash, we lose the check on the number of arguments that Perl does at compile time. There isn't a very good way to have signatures in Perl unfortunately (there's an experimental "use experimental 'signatures';" and some modules).

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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