[Integration] Track Rust-allocated memory

[pitrou]

Describe the enhancement requested

For C Data Interface integration testing, we'd like to track the memory allocated by the exporter to make sure that it's properly released when the importer drops the imported data.

For Rust, this isn't possible currently but may be doable once Rust stable supports custom allocators:
apache/arrow-rs#5080 (comment)

Component(s)

Integration