feat(derive): add JSON tagged derive to Enum

Author: paolobarbolini

Cargo.lock

@@ -13,7 +13,7 @@ rust-version.workspace = true
 proc-macro = true
 
 [package.metadata.docs.rs]
-features = ["postgres", "mysql"]
+features = ["postgres", "mysql", "json"]
 
 [dependencies]
 proc-macro2 = "1.0.94"
@@ -23,10 +23,12 @@ heck = "0.5.0"
 
 [dev-dependencies]
 diesel = { version = "2", default-features = false, features = ["postgres", "mysql_backend"] }
+serde = { version = "1", features = ["derive"] }
 
 [features]
 postgres = []
 mysql = []
+json = []
 
 [lints]
 workspace = true