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[C++] ArrayFromJSON for dictionary arrays #17096

Description

@asfimport

It would be useful for testing if ArrayFromJSON could be instructed to dictionary encode its values by passing a dictionary type.

auto dict_encoded_strings = ArrayFromJSON(dictionary(int8(), utf8()), R"([
  "whiskey", "tango", "foxtrot"
])");

See discussion #6641 (review)

Reporter: Ben Kietzman / @bkietz

Related issues:

Note: This issue was originally created as ARROW-8172. Please see the migration documentation for further details.

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