refactor: structure of an hexagonal architecture

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

lib/utils/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "utils"
+edition = "2021"
+
+[dependencies]
+anyhow = { workspace = true }
+argon2 = "0.5"
+base64 = "0.22"
+rand = "0.8.5"
+rand_core = { version = "0.6.4", features = ["std"] }