[Feat] new server adapter

[sleipnir]

Hi everyone, I'd like to talk a little about what I'm currently working on here.

I'm almost finished implementing a new server-side adapter entirely based on Elixir using the thousand_island library. And the results are promising, as we can see below.

Performance Metrics

Metric	Cowboy	ThousandIsland	Improvement
Requests Processed	1,475	3,115	+111% (2.11x)
Total Time	1.46s	0.86s	-41% (1.71x faster)
Throughput	~1,008 req/s	~3,637 req/s	+261%
Minimum Latency	618µs	177µs	-71% (3.5x faster)
Maximum Latency	89.1ms	39.6ms	-56% (2.25x faster)
Average Latency	~991µs	~274µs	-72% (3.6x faster)
CPU Time (User)	3.12s	1.72s	-45%
CPU Time (System)	0.50s	0.48s	-4%

Analysis

Advantages of ThousandIsland:

• Dramatically higher throughput:
  Processed more than double the number of requests in the same test period.
• Significantly lower latencies:
  • Minimum latency 3.5x lower
  • Maximum latency 2.25x lower
  • Average latency approximately 3.6x lower
• CPU efficiency:
  Used 45% less CPU time (user time).
• Reduced total execution time:
  Completed the tests in almost half the time

The ThousandIsland adapter demonstrates substantially superior performance compared to Cowboy across all measured aspects. The implementation delivers:

• Better throughput (~3.6x)
• Lower latencies (3–4x)
• Better resource efficiency

This is still a draft and needs a lot of refinement. I opened the PR just to document the work and share it with everyone.