Web Assembly target support

[rjzak]

Get steward to compile for Web Assembly. Currently, these modules are blocking this:

• Socket2: axum->hyper->socket2, axum->hyper->h2->tokio->socket2

[rjzak]

Internal PR:

• https://github.com/enarx/sgx/pull/93
• https://github.com/enarx/enarx/pull/2116

External PRs:

• https://github.com/tokio-rs/mio/pull/1576
• https://github.com/tokio-rs/mio/pull/1580
• https://github.com/tokio-rs/mio/pull/1581
• https://github.com/tokio-rs/tokio/pull/4716
• https://github.com/hyperium/hyper/pull/2900
• https://github.com/WebAssembly/wasi-crypto/pull/61
• https://github.com/WebAssembly/wasi-crypto/pull/62 (non-Profian person)
• https://github.com/dalek-cryptography/curve25519-dalek/pull/403
  • https://github.com/WebAssembly/wasi-crypto/issues/63
• https://github.com/WebAssembly/wasi-crypto/pull/64
• https://github.com/WebAssembly/wasi-crypto/pull/71
• https://github.com/bytecodealliance/wasmtime/pull/4612
• https://github.com/WebAssembly/wasi-crypto/pull/80

Test applications:

• rjzak/tokio-echo-test for Tokio on Wasi
• rjzak/axum-wasm-test for Axum & Tokio on Wasi
• rjzak/wasi-crypto-example for Wasi-crypto example

Seems a new release of Mio is needed, then the Tokio PR can be updated to use that new Mio release.

[rjzak]

Closed via https://github.com/profianinc/steward/pull/63