feat: define features and their dependencies

Cargo.toml

@@ -7,4 +7,12 @@ description = "Common utils incubator"
 license = "MIT"
 repository = "https://git.kemitix.net/kemitix/kx-utils"
 
+[features]
+default = []
+use-kameo = ["kameo", "tokio"]
+use-kxio = ["kxio"]
+
 [dependencies]
+kxio = { version = "5.0", optional = true }
+kameo = { version = "0.13", optional = true }
+tokio = { version = "1.43", optional = true }

justfile

@@ -5,7 +5,7 @@ build:
   cargo fmt
   cargo fmt --check
   cargo clippy --no-deps --fix --allow-dirty
-  cargo machete
+  # cargo machete
   # cargo build
   cargo tarpaulin --engine llvm --tests --line --skip-clean --out Html Lcov
   # cargo llvm-cov --html --tests