Moved Cronet code under Connectivity

$ cp -r Cronet/ Connectivity/
$ rm -r Cronet/*

Bug: 251054736
Test: atest CronetApiTest
Change-Id: I25d5238fe530ffaa830ce64c67b351d40b8030ea
CTS-Coverage-Bug: 251012627
diff --git a/Cronet/OWNERS b/Cronet/OWNERS
new file mode 100644
index 0000000..62c5737
--- /dev/null
+++ b/Cronet/OWNERS
@@ -0,0 +1,2 @@
+set noparent
+file:platform/packages/modules/Connectivity:master:/OWNERS_core_networking