feat(harmony_macros): add yaml macro to validate YAML input

- Introduced a new `yaml` macro in `harmony_macros` that validates if the provided YAML string is valid by attempting to deserialize it using `serde_yaml`.
- Added dependencies on `serde`, `serde_yaml` for handling YAML deserialization.
- Included dev dependencies with features enabled for deriving types from `serde`.

harmony-rs/harmony_macros/Cargo.toml

@@ -9,4 +9,9 @@ proc-macro = true
 [dependencies]
 harmony_types = { path = "../harmony_types" }
 quote = "1.0.37"
+serde = "1.0.217"
+serde_yaml = "0.9.34"
 syn = "2.0.90"
+
+[dev-dependencies]
+serde = { version = "1.0.217", features = ["derive"] }