Research for profiling tools for Rust

[josecelano]

Hi @WarmBeer @da2ce7, since @WarmBeer thinks the performance is a key feature of the tracker, I think we could try to run a profiling tool to find out the tracker's slowest parts.

For example:

• https://nnethercote.github.io/perf-book/profiling.html
• https://superluminal.eu/rust/

On the other hand, we could also add a performance test to detect changes that dramatically increase the response time.

We should also define which type of performance: memory consumption, response time, etcetera. From our discussions, I assume it's response time and especially the maximum time waiting for the server:

[josecelano]

Relates to: #733

[josecelano]

Relates to: https://torrust.com/profiling-the-torrust-bittorrent-udp-tracker