[zaidrain06]

Summary

Implements WebAssembly (.wasm) User-Defined Function (UDF) support in Dozer config and the dozer-sql-expression engine (#1653).

Key Changes

• Configuration (dozer-types/src/models/udf_config.rs & config.rs):
  • Added UdfType::Wasm(WasmConfig) supporting both tagged sequence syntax (!Wasm) and the concise udfs:\n wasm:\n my_function: udfs/wasm/my_function map syntax specified in WASM UDF support #1653 via deserialize_udfs.
  • Automatically resolves .wasm module paths with or without the .wasm file extension.
• SQL Expression Engine (dozer-sql/expression/src/wasm_udf.rs, builder.rs, execution.rs, error.rs):
  • Added Expression::WasmUdf and ExpressionBuilder::parse_wasm_udf to validate argument counts and types against the exported WebAssembly function signature at query build time.
  • Implemented a self-contained WebAssembly 1.0 binary module parser, validator, and deterministic stack-machine evaluator supporting i32, i64, f32, and f64 signatures, locals, globals, linear memory, and structured control flow (block, loop, if/else, br, br_if, call, return, select) with SQL NULL propagation.
• Tests:
  • Added YAML deserialization tests (wasm_udf_tagged, wasm_udf_map_in_config) in dozer-types/src/tests/udf_yaml_deserialize.rs.
  • Added SQL expression evaluation tests (test_wasm_udf_sql_evaluation_and_extensionless_path, test_wasm_udf_float_and_int_coercion) in dozer-sql/expression/src/wasm_udf.rs.

Verification

$ cargo test -p dozer-types udf
running 3 tests
test tests::udf_yaml_deserialize::standard ... ok
test tests::udf_yaml_deserialize::wasm_udf_map_in_config ... ok
test tests::udf_yaml_deserialize::wasm_udf_tagged ... ok

$ cargo test -p dozer-sql-expression --lib
running 29 tests
...
test wasm_udf::tests::test_wasm_udf_float_and_int_coercion ... ok
test wasm_udf::tests::test_wasm_udf_sql_evaluation_and_extensionless_path ... ok
test result: ok. 29 passed; 0 failed

Closes #1653
/claim #1653

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