Add new module to hold test utils for AppSearch

Also
1) move the SetSchemaStats unit tests to CTS tests
2) skip the export for the cts tests using the logger

The change is copied from ag/15515790.

Test: appsearch:appsearch:connectedCheck,
appsearch: appsearch-test-util:connectedCheck,
appsearch: appsearch-local-storage:connectedCheck,
appsearch: appsearch-platform-storage:connectedCheck
Change-Id: Ib4980c100fd93529ecb587e359325454550f6876

diff --git a/settings.gradle b/settings.gradle
index e0e3fad..87cc169 100644
--- a/settings.gradle
+++ b/settings.gradle

@@ -210,6 +210,7 @@
 includeProject(":appsearch:appsearch-ktx", "appsearch/appsearch-ktx", [BuildType.MAIN])
 includeProject(":appsearch:appsearch-local-storage", "appsearch/appsearch-local-storage", [BuildType.MAIN])
 includeProject(":appsearch:appsearch-platform-storage", "appsearch/appsearch-platform-storage", [BuildType.MAIN])
+includeProject(":appsearch:appsearch-test-util", "appsearch/appsearch-test-util", [BuildType.MAIN])
 includeProject(":arch:core:core-common", "arch/core/core-common", [BuildType.MAIN])
 includeProject(":arch:core:core-runtime", "arch/core/core-runtime", [BuildType.MAIN])
 includeProject(":arch:core:core-testing", "arch/core/core-testing", [BuildType.MAIN])