[Tether17] create com.android.tethering.apex package

Add APEX com.android.tethering.apex for tethering module.
It have tethering apk now and would have jar and library
in follow up CL.

Bug:144320626
Test: build
Change-Id: Ie6158639886e90180dd90347e802a5fe062031b2
diff --git a/Tethering/apex/com.android.tethering.apex.x509.pem b/Tethering/apex/com.android.tethering.apex.x509.pem
new file mode 100644
index 0000000..a5e9401
--- /dev/null
+++ b/Tethering/apex/com.android.tethering.apex.x509.pem
@@ -0,0 +1,36 @@
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