Add memory catalog implementation

crates/catalog/inmemory/Cargo.toml

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+# 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 = "iceberg-catalog-inmemory"
+version = { workspace = true }
+edition = { workspace = true }
+homepage = { workspace = true }
+rust-version = { workspace = true }
+
+categories = ["database"]
+description = "Apache Iceberg Rust In-Memory Catalog API"
+repository = { workspace = true }
+license = { workspace = true }
+keywords = ["iceberg", "inmemory", "catalog"]
+
+[dependencies]
+async-trait = { workspace = true }
+futures = { workspace = true }
+iceberg = { workspace = true }
+itertools = { workspace = true }
+serde_json = { workspace = true }
+uuid = { workspace = true, features = ["v4"] }
+
+[dev-dependencies]
+tempfile = { workspace = true }
+tokio = { workspace = true }

crates/catalog/inmemory/README.md

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+<!--
+  ~ 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.
+-->
+
+# Apache Iceberg In-Memory Catalog Official Native Rust Implementation
+
+[![crates.io](https://img.shields.io/crates/v/iceberg-catalog-inmemory.svg)](https://crates.io/crates/iceberg-catalog-inmemory)
+[![docs.rs](https://img.shields.io/docsrs/iceberg-catalog-inmemory.svg)](https://docs.rs/iceberg/latest/iceberg-catalog-inmemory/)
+
+This crate contains the official Native Rust implementation of Apache Iceberg In-Memory Catalog.
+
+See the [API documentation](https://docs.rs/iceberg-catalog-inmemory/latest) for examples and the full API.