chore: Setup code skeleton of datanode

src/sql/Cargo.toml

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+[package]
+name = "sql"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+sqlparser = "0.16.0"

src/sql/src/ast.rs

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+

src/sql/src/lib.rs

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+mod ast;
+mod parser;
+mod planner;

src/sql/src/parser.rs

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+

src/sql/src/planner.rs

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+