Separate snapshot definition

Current snapshot definition is located in the CC module, so it is
difficult to capture non-CC module (such as prebuilt_etc) to the
snapshot. Separate general snapshot definition from cc so other modules
can also define its own snapshot.

Bug: 192430376
Test: m nothing passed
Change-Id: Ifb69fb3d2ec555b629aa31ec03e7ce5831fd3063

snapshot/Android.bp

@@ -0,0 +1,21 @@
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+bootstrap_go_package {
+    name: "soong-snapshot",
+    pkgPath: "android/soong/snapshot",
+    deps: [
+        "blueprint",
+        "blueprint-pathtools",
+        "soong",
+        "soong-android",
+    ],
+    srcs: [
+        "recovery_snapshot.go",
+        "snapshot.go",
+        "snapshot_base.go",
+        "vendor_snapshot.go",
+    ],
+    pluginFor: ["soong_build"],
+}