Remove aggregate functions dependency on frontend (#12715)

* Remove aggregate functions dependency on frontend

DataFusion is a SQL query engine and also a reusable library for
building query engines. The core functionality should not depend on
frontend related functionalities like `sqlparser` or `datafusion-sql`.

* Remove duplicate license header

Author: findepi

datafusion-cli/Cargo.lock

@@ -50,7 +50,6 @@ datafusion-physical-expr-common = { workspace = true }
 half = { workspace = true }
 log = { workspace = true }
 paste = "1.0.14"
-sqlparser = { workspace = true }
 
 [dev-dependencies]
 arrow = { workspace = true, features = ["test_utils"] }

datafusion/functions-aggregate/Cargo.toml

@@ -15,23 +15,6 @@
 // specific language governing permissions and limitations
 // under the License.
 
-// Licensed to the Apache Software Foundation (ASF) under one
-// or more contributor license agreements.  See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership.  The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License.  You may obtain a copy of the License at
-//
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing,
-// software distributed under the License is distributed on an
-// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-// KIND, either express or implied.  See the License for the
-// specific language governing permissions and limitations
-// under the License.
-
 macro_rules! make_udaf_expr {
     ($EXPR_FN:ident, $($arg:ident)*, $DOC:expr, $AGGREGATE_UDF_FN:ident) => {
         // "fluent expr_fn" style function