feat(search): match geographic entities in search

[marcelgerber]

Part of #3330.

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TODOs:

• Make this feature more discoverable:
  • Add something like Life expectancy India Nigeria to the placeholder text
  • Add a hint text somewhere? (needs design)
  • Provide suggestions in an autocomplete menu?
• Sort entities alphabetically, probably?
• Figure out a better way to produce availableEntityNames for Algolia:
  • Only list selected entities for charts with EntitySelectionMode.Disabled [population by world region Laos]
    • Here, the different entity selection modes bite us a bit I think - scatter and slope work differently for selection
  • For StackedArea charts and so on, use the intersection of different variables, i.e. tableForSelection [example chart, meat production by type argentina]
  • What to do for map charts?
  • ➡️ Solved via feat: index chart entities into charts_x_entities table #3418 & feat(algolia): use charts_x_entities table for Algolia indexing #3424
• Use different icon for non-region entities, e.g. salmon (farmed)
• Try to prevent matches like Korea (former) for South Korea [regime polity south korea]
• Figure out the Algolia situation with synonyms (UK -> United Kingdom, UAE -> United Arab Emirates)
  • Algolia community ticket
  • life expectancy uae
  • sex ratio uk
• Remove feature disparity between full search page and Autocomplete search
• What to do about explorer views? Tricky... feat(search): pre-select explorer entities if they appear in search query #3483
• Check why there's no matches for "high-income countries" - maybe because of the hyphen?
  • Potentially add a synonym for that
• Move /thumbnail URL to .env file
• Entity indexing: Why does access-to-clean-fuels-and-technologies-for-cooking supposedly have data for "Low-income countries", even though it hasn't?

[marcelgerber]

• feat(search): match geographic entities in search #3388 👈
• enhance(search): Search utils #3480 : 1 other dependent PR (#3481 )
• master

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