[Java] Read and write record batches to shared memory

It would be useful for a Java application to be able to read a record batch as a set of memory mapped byte buffers given a file name and a memory address for the metadata.

**Reporter**: [Wes McKinney](https://issues.apache.org/jira/browse/ARROW-721) / @wesm

_{**Note**: *This issue was originally created as [ARROW-721](https://issues.apache.org/jira/browse/ARROW-721). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

The issue does not name any files, tests, or Java entry points. Begin by locating the Java code that reads and writes record batches, then investigate how memory-mapped byte buffers, a file name, and a metadata memory address could be supported. Done should include a defined read/write API and coverage for shared-memory record batches.

Written by the indexing model from the issue text.