Relax MAX_TRANSMIT_SEGMENTS

[filipe-cantarelli]

After moving MAX_TRANSMIT_SEGMENTS limitation from quinn-proto to quinn in https://github.com/quinn-rs/quinn/pull/2185 , I'd like to understand if it's possible to relax it, by either increasing it or dropping.

This issue was created to follow up on this discussion and decide the path forward. Are there any benchmarks on the subject? I suspect at a minimum we want to:

• Test a range of values for it: 10,30,60...
• Test in the major supported platforms
• Possibly test it with different MTU sizes? 1200, 1500(ethernet), but also testing with Jumbo frames?

What's the data we want to collect? Possbily:

• Throughput
• Latency
• Error rate