Add metadata for `cargo binstall` (#8681)

This was pioneered in bytecodealliance/wasm-tools#1562 and looks to be
working well so I've copied over similar metadata for Wasmtime. I've
seen the `cargo binstall` method of installing binaries to be somewhat
common and we've already got all the necessary binaries so it seemed
nice to add support. Wasmtime doesn't name the artifacts after Rust
target names so some manual configuration is required here, but
otherwise this hopefully isn't too costly to maintain.

Cargo.toml

@@ -13,6 +13,24 @@ edition.workspace = true
 default-run = "wasmtime"
 rust-version.workspace = true
 
+[package.metadata.binstall]
+pkg-url = "{repo}/releases/download/v{version}/{name}-v{version}-{target-arch}-{target-family}{archive-suffix}"
+bin-dir = "{name}-{version}-{target-arch}-{target-family}/{bin}{binary-ext}"
+pkg-fmt = "txz"
+[package.metadata.binstall.overrides.x86_64-apple-darwin]
+pkg-url = "{repo}/releases/download/v{version}/{name}-v{version}-{target-arch}-macos{archive-suffix}"
+bin-dir = "{name}-v{version}-{target-arch}-macos/{bin}{binary-ext}"
+[package.metadata.binstall.overrides.aarch64-apple-darwin]
+pkg-url = "{repo}/releases/download/v{version}/{name}-v{version}-{target-arch}-macos{archive-suffix}"
+bin-dir = "{name}-v{version}-{target-arch}-macos/{bin}{binary-ext}"
+[package.metadata.binstall.overrides.x86_64-pc-windows-msvc]
+pkg-fmt = "zip"
+[package.metadata.binstall.overrides.x86_64-pc-windows-gnu]
+pkg-fmt = "zip"
+[package.metadata.binstall.overrides.x86_64-unknown-linux-musl]
+pkg-url = "{repo}/releases/download/v{version}/{name}-v{version}-{target-arch}-musl{archive-suffix}"
+bin-dir = "{name}-v{version}-{target-arch}-musl/{bin}{binary-ext}"
+
 [lints]
 workspace = true