fix: use internally tagged serde repr for TypeSpecificInfo

this means we would generate `{kind: "<tag>", <other-fields>..}`
which is easier for me to produce from ruby i think?

https://serde.rs/enum-representations.html#internally-tagged

Author: alehander92

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "trace_types"
-version = "0.4.0"
+version = "0.4.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

src/lib.rs

@@ -173,6 +173,7 @@ pub struct FieldTypeRecord {
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "kind")]
 pub enum TypeSpecificInfo {
     None,
     Struct { fields: Vec<FieldTypeRecord> },