Add API for Creating Variant Values

Cargo.toml

@@ -37,6 +37,7 @@ members = [
     "arrow-schema",
     "arrow-select",
     "arrow-string",
+    "arrow-variant",
     "parquet",
     "parquet_derive",
     "parquet_derive_test",

arrow-variant/Cargo.toml

@@ -0,0 +1,52 @@
+# 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.
+
+[package]
+name = "arrow-variant"
+version = { workspace = true }
+description = "Rust API for reading/writing Apache Parquet Variant values"
+homepage = { workspace = true }
+repository = { workspace = true }
+authors = { workspace = true }
+license = { workspace = true }
+keywords = ["arrow"]
+include = [
+    "src/**/*.rs",
+    "Cargo.toml",
+]
+edition = { workspace = true }
+rust-version = { workspace = true }
+
+[lib]
+name = "arrow_variant"
+path = "src/lib.rs"
+
+[features]
+default = []
+
+[dependencies]
+arrow-array = { workspace = true }
+arrow-buffer = { workspace = true }
+arrow-cast = { workspace = true, optional = true }
+arrow-data = { workspace = true }
+arrow-schema = { workspace = true, features = ["canonical_extension_types"] }
+serde = { version = "1.0", default-features = false }
+serde_json = { version = "1.0", default-features = false, features = ["std"] }
+indexmap = "2.0.0"
+
+[dev-dependencies]
+arrow-cast = { workspace = true }