feat: Make the crate no_std+alloc compatible

Cargo.toml

@@ -7,12 +7,17 @@ license = "MIT"
 repository = "https://github.com/wot-rust/wot-td"
 keywords = ["wot", "WebofThings"]
 
+[features]
+default = ["std"]
+std = ["serde/std", "serde_json/std", "serde_with/std", "time/std"]
+alloc = ["serde/alloc", "serde_json/alloc", "serde_with/alloc", "time/alloc"]
+
 [dependencies]
-oxilangtag = { version = "0.1.3", features = ["serde"] }
+oxilangtag = { version = "0.1.5", features = ["serde"] }
 serde = { version = "1.0.137", features = ["derive"] }
-serde_json = "1.0.81"
+serde_json = { version = "1.0.81", default-features = false }
 serde_repr = "0.1.9"
-serde_with = "3.4.0"
+serde_with = { version = "3.7.0", features = ["macros"] }
 thiserror = "1.0.31"
 time = { version = "0.3.11", features = ["serde", "serde-well-known"] }