wiggle: borrow checker lives in own crate, and supports both mut/immut

crates/wiggle/borrow/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "wiggle-borrow"
+version = "0.21.0"
+authors = ["Pat Hickey <phickey@fastly.com>", "Jakub Konka <kubkonk@jakubkonka.com>", "Alex Crichton <alex@alexcrichton.com>"]
+edition = "2018"
+license = "Apache-2.0 WITH LLVM-exception"
+description = "A run-time borrow checker for use with Wiggle"
+categories = ["wasm"]
+keywords = ["webassembly", "wasm"]
+repository = "https://github.com/bytecodealliance/wasmtime"
+include = ["src/**/*", "LICENSE"]
+
+[dependencies]
+wiggle = { path = "..", version = "0.21.0" }
+
+[badges]
+maintenance = { status = "actively-developed" }