[Java][Memory] Fix Netty ArrowBuf Slice #21926
Description
The slice of netty arrow buf depends on arrow buf reader and writer indexes, but arrow buf is supposed to only track memory addr + length and there are places where the arrow buf indexes are not in sync with netty.
So slice should use the indexes in Netty Arrow Buf instead.
Reporter: Praveen Kumar / @praveenbingo
Assignee: Praveen Kumar / @praveenbingo
PRs and other links:
Note: This issue was originally created as ARROW-5476. Please see the migration documentation for further details.