Restructure the native module

Consolidate all code into the src folder

native/src/Cargo.toml

@@ -0,0 +1,26 @@
+[workspace]
+
+members = [
+    "base",
+    "boot",
+    "core",
+    "init",
+    "sepolicy",
+]
+
+[profile.dev]
+opt-level = "z"
+lto = true
+codegen-units = 1
+panic = "abort"
+strip = true
+
+[profile.release]
+opt-level = "z"
+lto = true
+codegen-units = 1
+panic = "abort"
+strip = true
+
+[patch.crates-io]
+cxx = { path = "../src/external/cxx-rs" }