feat(ffi): add run end encoded arrays

[notfilippo]

Which issue does this PR close?

Closes #5631.

[alamb]

Thank you very much for this contribution @notfilippo 🙏

I think this is looking pretty close to mergeable, it just needs a test for nullable values.

I was hoping we could add an integration test to verify compatibility with the other arrow implementations https://github.com/apache/arrow-rs/blob/master/arrow-integration-testing/tests/ipc_reader.rs

However, I couldn't find any existing data file that has an REE array in it 🤔
https://github.com/apache/arrow-testing/tree/master/data/arrow-ipc-stream/integration/

[notfilippo]

I was hoping we could add an integration test to verify compatibility with the other arrow implementations https://github.com/apache/arrow-rs/blob/master/arrow-integration-testing/tests/ipc_reader.rs

However, I couldn't find any existing data file that has an REE array in it 🤔 https://github.com/apache/arrow-testing/tree/master/data/arrow-ipc-stream/integration/

Thanks, I can look into that as well

[alamb]

Looks good to me -- thank you again @notfilippo