[Java] Add non-static approach in DictionaryEncoder making it easy to extend and reuse #22586
Description
As discussed in #4994.
Current static DictionaryEncoder has some limitation for extension and reuse.
Slightly change the APIs and migrate static method to object based approach.
Reporter: Ji Liu / @tianchen92
Assignee: Ji Liu / @tianchen92
PRs and other links:
Note: This issue was originally created as ARROW-6194. Please see the migration documentation for further details.