[Java] Remove Netty dependency from arrow-vector

[lidavidm]

Describe the enhancement requested

#14913 removes a lot of uses of Netty from the core Arrow modules in favor of our own classes. If we could replace the remaining uses of Netty, we could drop the hard dependency on Netty entirely, so that it's only required if you use arrow-memory-netty or arrow-flight.

From #14913 (comment):

PlatformDependent was used in arrow-algorithm, arrow-jdbc, arrow-memory-netty, arrow-vector. I've removed the usages in arrow-algorithm, arrow-jdbc and arrow-vector, and removed the dependency of netty-common in arrow-algorithm and arrow-jdbc. It would take a bit more job to remove dependency of netty-common in arrow-vector as it is using some Netty collection utils llike IntObjectMap. Maybe do that in follow up.

Component(s)

Java

[sudip-unb]

Interested to work on this issue.

[lidavidm]

@sudip-unb if you're interested, please feel free to file a PR; you can comment 'take' here to have the bot assign this issue to you as well

[jduo]

take

[jduo]

We probably don't want to re-implement IntObjectHashMap. Can we simply take the Netty implementation and add it to the Arrow project? It Netty has an Apache 2.0 license.

[lidavidm]

Vendoring is fine, yes (just update LICENSE to reflect that). Or we could possibly pull in Eclipse or Apache Commons equivalents if they exist.