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niranda pereraKrisztián Szűcs
de51528eef7
niranda perera authored and Krisztián Szűcs committed a47deef69ea
ARROW-11673 - [C++] Casting dictionary type to use different index type

This PR adds casting from one dictionary type to anther dictionary type for both scalars and arrays :
ex:
```
dictionary(int8(), int16()) --> dictionary(int32(), int64())
```

Closes #10721 from nirandaperera/ARROW-11673

Lead-authored-by: niranda perera <niranda.perera@gmail.com>
Co-authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>