restructure cap-std impls into their own crate

crates/wasi-c2/cap-std-sync/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "wasi-c2-cap-std-sync"
+version = "0.22.0"
+authors = ["The Wasmtime Project Developers"]
+description = "WASI implementation in Rust"
+license = "Apache-2.0 WITH LLVM-exception"
+categories = ["wasm"]
+keywords = ["webassembly", "wasm"]
+repository = "https://github.com/bytecodealliance/wasmtime"
+readme = "README.md"
+edition = "2018"
+include = ["src/**/*", "LICENSE" ]
+publish = false
+
+[dependencies]
+wasi-c2 = { path = "../" }
+cap-std = "0.9"
+cap-fs-ext = "0.9"
+cap-time-ext = "0.9"
+cap-rand = "0.9"
+fs-set-times = "0.2.2"
+yanix = "0.22"
+system-interface = { version = "0.5", features = ["cap_std_impls"] }
+tracing = "0.1.19"
+libc = "0.2"