Add separated runtime crate

lib/runtime/src/lib.rs

@@ -0,0 +1,29 @@
+#[macro_use]
+mod macros;
+mod backend;
+mod backing;
+mod instance;
+mod memory;
+mod module;
+mod sig_registry;
+mod table;
+mod recovery;
+mod sighandler;
+mod mmap;
+pub mod types;
+pub mod vm;
+pub mod vmcalls;
+
+pub use self::backend::{Compiler, FuncResolver};
+pub use self::instance::{Import, ImportResolver, Imports, Instance};
+pub use self::module::Module;
+pub use self::sig_registry::SigRegistry;
+pub use self::memory::LinearMemory;
+
+/// Compile a webassembly module using the provided compiler.
+pub fn compile(
+    wasm: &[u8],
+    compiler: &dyn Compiler,
+) -> Result<Module, String> {
+    compiler.compile(wasm)
+}