Moved DigestItem impl to impl_outer_log (#932)

* moved DigestItem impl to impl_outer_log

* Enable backtrace collecting on the CI

* internal module is not required in impl_outer_log

* Revert "internal module is not required in impl_outer_log"

This reverts commit 5430446971cdf5fd5735863b86cd08a11d35d1dd.

* Revert "moved DigestItem impl to impl_outer_log"

This reverts commit 8872bbee963dbb4316251222f5c0757303fb3f52.

* Revert "Revert "moved DigestItem impl to impl_outer_log""

This reverts commit 47afd59682f8828665bd9cfb293b40ce4c4787af.

* Revert "Revert "internal module is not required in impl_outer_log""

This reverts commit 9ae640010c00ef134099d5b6a4430d330be134b2.

* More diagnostics

* check if only 1 test fails

* test is back + some "traces"

* removed some traces

* removed "traces"