Enable naming lint

Veryl.toml

@@ -9,6 +9,27 @@ repository  = "https://github.com/veryl-lang/std"
 [build]
 target = {type = "directory", path = "target/src"}
 
+[lint.naming]
+case_enum          = "snake"
+case_function      = "snake"
+case_instance      = "snake"
+case_interface     = "snake"
+case_modport       = "snake"
+case_module        = "snake"
+case_package       = "snake"
+case_parameter     = "screaming_snake"
+case_port_inout    = "snake"
+case_port_input    = "snake"
+case_port_modport  = "snake"
+case_port_output   = "snake"
+case_reg           = "snake"
+case_struct        = "snake"
+case_union         = "snake"
+case_var           = "snake"
+case_wire          = "snake"
+prefix_port_input  = "i_"
+prefix_port_output = "o_"
+
 [doc]
 path = "target/doc"