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/hurl_integration/scenario_1/main.hurl

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+GET {{ base_url }}/api
+HTTP 200
+[Asserts]
+jsonpath "$.software" == "Minauthator"
+
+POST {{ base_url }}/login
+[FormParams]
+login: root
+password: root
+HTTP 303
+[Captures]
+user_jwt: cookie "minauthator_jwt"
+[Asserts]
+cookie "minauthator_jwt" exists
+cookie "minauthator_jwt[Value]" contains "eyJ0"
+cookie "minauthator_jwt[SameSite]" == "Lax"
+
+GET {{ base_url }}/me
+HTTP 200
+Content-Type: text/html; charset=utf-8
+[Asserts]
+xpath "string(///h1)" == "Welcome root!"
+
+POST {{ base_url }}/me/details-form
+[MultipartFormData]
+handle: root
+email: root@johndoe.net
+full_name: John Doe
+website: https://johndoe.net
+picture: file,john_doe_profile_pic.jpg; image/jpeg
+HTTP 200
+
+GET {{ base_url }}/me/authorizations
+HTTP 200
+[Asserts]
+xpath "string(///h1)" == "Your authorizations"
+xpath "string(///i)" == "You didn't authorized or accessed any applications for now."
+
+# OAuth2 implicit flow (pre-granted app)
+GET {{ base_url }}/authorize
+[QueryStringParams]
+client_id: 00000001-0000-0000-0000-000000000001
+response_type: code
+redirect_uri: http://localhost:9090/callback
+state: Afk4kf6pbZkms78jM
+scope: user_read_basic
+HTTP 302
+[Asserts]
+header "Location" contains "http://localhost:9090/callback?code="
+[Captures]
+authorization_code: header "Location" regex "\\?code=(.*)&"
+
+# OAuth2 get access token
+POST {{ base_url }}/api/token
+[BasicAuth]
+00000001-0000-0000-0000-000000000001: dummy_client_secret
+[FormParams]
+code: {{ authorization_code }}
+scope: user_read_basic
+redirect_uri: http://localhost:9090/callback
+grant_type: authorization_code
+HTTP 200
+Content-Type: application/json
+[Asserts]
+jsonpath "$.access_token" exists
+jsonpath "$.access_token" matches "eyJ[[:alpha:]0-9].[[:alpha:]0-9].[[:alpha:]0-9]"
+[Captures]
+access_token: jsonpath "$.access_token"
+
+# Get basic user info
+GET {{ base_url }}/api/user
+Authorization: JWT {{ access_token }}
+HTTP 200
+Content-Type: application/json
+[Asserts]
+jsonpath "$.handle" == "root"
+jsonpath "$.email" == "root@johndoe.net"
+
+GET {{ base_url }}/me/authorizations
+HTTP 200
+[Asserts]
+xpath "string(///h1)" == "Your authorizations"
+xpath "string(///main/ul/li)" contains "UserReadBasic"
+
+GET {{ base_url }}/logout
+HTTP 303
+[Asserts]
+cookie "minauthator_jwt" == ""