chore(query): replacing closures in FunctionEval with traits

src/query/codegen/Cargo.toml

@@ -12,7 +12,6 @@ path = "src/bin/codegen.rs"
 
 [dependencies]
 databend-common-expression = { workspace = true }
-itertools = { workspace = true }
 
 [lints]
 workspace = true

src/query/codegen/src/bin/codegen.rs

@@ -14,6 +14,5 @@
 
 fn main() {
     databend_codegen::writes::codegen_arithmetic_type();
-    databend_codegen::writes::codegen_register();
     databend_codegen::writes::codegen_hilbert_lut();
 }

src/query/codegen/src/writes/mod.rs

@@ -14,8 +14,6 @@
 
 mod arithmetics_type;
 mod hilbert_lut;
-mod register;
 
 pub use arithmetics_type::*;
 pub use hilbert_lut::*;
-pub use register::*;