ARROW-6870: [C#] Added Dictionary Array Types#5644

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dparu-dev wants to merge 2 commits intoapache:masterfrom

dparu-dev:master

Commits on Oct 11, 2019

Added basic support for DictionaryArray types
dparu-dev
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Commits on Oct 13, 2019

I forgot the license text like an idiot, fixed now
dparu-dev
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