Initial commit: duck derive macros

README.md

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+`libduck` provides quality-of-life features for [duckdb-rs](https://github.com/duckdb/duckdb-rs). See doc comments in `lib.rs` for details.
+
+## TODO:
+
+- `CAST(? AS JSON)` hack docs, feature, and example
+- features (utoipa, url, etc)
+- tests
+  - simple struct, all types
+  - u8/blob
+  - json
+  - option json and blob (Option must be external)
+  - nested structs
+  - string enums
+  - arc json, arc blob (repeated nesting)
+- docstring examples (from tests)