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Kenta MurataAntoine Pitrou
7e397119f8b
Kenta Murata authored and Antoine Pitrou committed 2272d9a2e4e
ARROW-9642: [C++] Let MakeBuilder refer DictionaryType's index_type for deciding the starting bit width of the indices

As [the discussion in arrow-dev ML](https://lists.apache.org/thread.html/r69b17b5043bc629507440e962fd50d087c8833cd70682651c6ebda3d%40%3Cdev.arrow.apache.org%3E), it may be better that when creating a dictionary builder by MakeBuilder function, we can specify the starting bit width of the builder's index by the dictionary index type specified in the argument of MakeBuilder.

Closes #7898 from mrkn/ARROW-9642

Lead-authored-by: Kenta Murata <mrkn@mrkn.jp>
Co-authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>