Introduce perma-unstable `wasm-c-abi` flag Now that `wasm-bindgen` v0.2.88 supports the spec-compliant C ABI, the idea is to switch to that in a future version of Rust. In the meantime it would be good to let people test and play around with it. This PR introduces a new perma-unstable `-Zwasm-c-abi` compiler flag, which switches to the new spec-compliant C ABI when targeting `wasm32-unknown-unknown`. Alternatively, we could also stabilize this and then deprecate it when we switch. I will leave this to the Rust maintainers to decide. This is a companion PR to #117918, but they could be merged independently. MCP: https://github.com/rust-lang/compiler-team/issues/703 Tracking issue: https://github.com/rust-lang/rust/issues/122532
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