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ARROW-6113: [Java] Support vector deduplicate function

Remove adjacent deduplicated elements from a vector. This function can be used, for example, in finding distinct values, or in compressing the vector data.

Closes #4993 from liyafan82/fly_0722_dedup and squashes the following commits:

c53cbdb80 <liyafan82>  Add comment for parameters
bd1fabd4b <emkornfield> Update VectorRunDeduplicator.java
611dcd2cf <liyafan82>  Support vector deduplicate function

Lead-authored-by: liyafan82 <fan_li_ya@foxmail.com>
Co-authored-by: emkornfield <emkornfield@gmail.com>
Signed-off-by: Micah Kornfield <emkornfield@gmail.com>