Rust synchronous Programming benchmarks

This comprehensive benchmark suite tests Tokio, async-std, and smol across five key scenarios:

Benchmark Categories

1. Task Spawning - Raw task creation/completion speed

2. Channel Communication - Message passing between tasks

3. Timer Operations - Sleep/timeout efficiency

4. Concurrent Tasks - Performance under high load

5. TCP Echo Server - Real network I/O performance

6. Run benchmarks:

   ./run_benchmarks.sh

7. Individual runtime tests:

   cargo run --release --bin tokio_bench
   cargo run --release --bin async_std_bench
   cargo run --release --bin smol_bench

8. Criterion detailed benchmarks:

   cargo bench
   # Results in target/criterion/report/index.html

benchmark Reports

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