[Java] Support sort & compare for all variable width vectors

[asfimport]

All types of variable-width vector can reuse the same comparator for sorting & searching.

Reporter: Liya Fan / @liyafan82
Assignee: Liya Fan / @liyafan82

Related issues:

• [Java] DefaultVectorComparators does not have a comparator for BaseLargeVariableVector (relates to)

PRs and other links:

• GitHub Pull Request #4860

_{Note: This issue was originally created as ARROW-5920. Please see the migration documentation for further details.}

[asfimport]

Micah Kornfield / @emkornfield:
Issue resolved by pull request 4860
#4860