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ARROW-6155: [Java] Extract a super interface for vectors whose elements reside in continuous memory segments

For vectors whose data elements reside in continuous memory segments, they should implement a common super interface. This will avoid unnecessary code branches.

For now, such vectors include fixed-width vectors and variable-width vectors. In the future, there can be more vectors included.

Closes #5028 from liyafan82/fly_0807_addr and squashes the following commits:

ed4e26f03 <liyafan82>  Extract a super interface for vectors whose elements reside in continuous memory segments

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