Move StringPool to libandroidfw

Test: verified affected tests pass
Bug: 232940948
Change-Id: I22089893d7e5013f759c39ce190bec07fa6435db
diff --git a/tools/aapt2/Resources.proto b/tools/aapt2/Resources.proto
index 95b7949..2a450ba 100644
--- a/tools/aapt2/Resources.proto
+++ b/tools/aapt2/Resources.proto
@@ -636,4 +636,4 @@
 message UntranslatableSection {
   uint64 start_index = 1;
   uint64 end_index = 2;
-}
\ No newline at end of file
+}