Split out the nsd API surface and use framework-connectivity-tiramisu

- Split out nsd APIs and hidden APIs to Connectivity module.
- Keep the all files in f/b/packages/Connectivity-T and add
  framework-connectivity-tiramisu library on p/m/Connectivity.
  Then make framework to use this module library.
- Remove NsdService from SystemServer which will register from
  ConnectivityServiceInitializer

Bug: 206893064
Test: m online-sdk-dev-docs
Test: atest FrameworksNetTests CtsNetTestCases
CTS-Coverage-Bug: 207804007
Merged-In: I72c7de124b9cc53f2263bd452ecd5f39e88e485b
Change-Id: I72c7de124b9cc53f2263bd452ecd5f39e88e485b

framework-t/Sources.bp

@@ -156,8 +156,18 @@ filegroup {
         ":framework-connectivity-ethernet-sources",
         ":framework-connectivity-ipsec-sources",
         ":framework-connectivity-netstats-sources",
-        ":framework-connectivity-nsd-sources",
-        ":framework-connectivity-tiramisu-internal-sources",
     ],
     visibility: ["//frameworks/base"],
 }
+
+filegroup {
+    name: "framework-connectivity-tiramisu-updatable-sources",
+    srcs: [
+        ":framework-connectivity-nsd-sources",
+        ":framework-connectivity-tiramisu-internal-sources",
+    ],
+    visibility: [
+        "//frameworks/base",
+        "//packages/modules/Connectivity:__subpackages__",
+    ],
+}