Sepolicy: Initial Apexd pre-/postinstall rules

Give apexd permission to execute sh.

Add userdebug_or_eng domains and rules for the test
APEX for pre- and post-install.

Bug: 119260955
Bug: 119261380
Test: atest apexservice_test
Change-Id: I0c4a5e35e096101a53c9d1f212d2db2e63728267
diff --git a/apex/apex.test-file_contexts b/apex/apex.test-file_contexts
index 784ad54..a14e14b 100644
--- a/apex/apex.test-file_contexts
+++ b/apex/apex.test-file_contexts
@@ -1,2 +1,4 @@
-(/.*)?                 u:object_r:system_file:s0
-/bin/surfaceflinger    u:object_r:surfaceflinger_exec:s0
+/bin/apex_test_preInstallHook  u:object_r:apex_test_prepostinstall_exec:s0
+/bin/apex_test_postInstallHook u:object_r:apex_test_prepostinstall_exec:s0
+(/.*)?                         u:object_r:system_file:s0
+/bin/surfaceflinger            u:object_r:surfaceflinger_exec:s0