Test code for Axum, Tokio, WASI

Compiling:

1. Build with Tokio unstable flag:
   • RUSTFLAGS="--cfg tokio_unstable" cargo build

Run with Enarx:

1. Get Enarx
2. Run: CARGO_TARGET_WASM32_WASI_RUNNER="enarx run --wasmcfgfile Enarx.toml" cargo run --target=wasm32-wasi

Run with Wasmtime:

1. Get Wasmtime
2. Run: CARGO_TARGET_WASM32_WASI_RUNNER="wasmtime run --tcplisten 127.0.0.1:8080 --env FD_COUNT=3" cargo run --target=wasm32-wasi