refactor: structure of an hexagonal architecture

Created a kernel crate to store models and future action implementations.
Will be useful to create admin cli.

tests/manual/authorize.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/sh
+
+curl -v http://localhost:8085/authorize \
+    -G \
+    -D "tmp/headers.txt" \
+    --cookie "tmp/.curl-cookies" \
+    -d client_id="a1785786-8be1-443c-9a6f-35feed703609" \
+    -d response_type="code" \
+    -d redirect_uri="http://localhost:9090/callback" \
+    -d scope="user_read_basic" \
+    -d state="qxYAfk4kf6pbZkms78jM"
+
+code="$(cat tmp/headers.txt | grep -i "location" | awk -F ": " '{print $2}' | trurl -f - -g "{query:code}")"
+
+echo "$code" > tmp/authorize_code.txt