Add memory consumption decoder benchmarks

[scotts]

🚀 The feature

We currently have a benchmark that's main purpose is to detect memory leaks: memprofile_decoders.py. While it does report total memory usage for TorchCodec, that's not its purpose.

What we would have, ideally, is a benchmark that meets the following purposes:

1. Measures memory usage of a decoder, both resident set size and virtual size.
2. Compares TorchCodec to other available open source decoders.
3. Configurable to be run quickly (less than 5 seconds) for interactive debugging and longer (more than 1 minute) for more formal experiments.