[SPARK-52428] Add parameterized SQL support (named and positional args)

[rafafrdz]

Summary

• Add sql_with_args() for named parameters (:name syntax) using HashMap<String, Literal>
• Add sql_with_pos_args() for positional parameters (? syntax) using Vec<Literal>
• Existing sql() method unchanged

Usage:

let mut args = HashMap::new();
args.insert("threshold".to_string(), Literal::from(100i32));
let df = spark.sql_with_args("SELECT * FROM t WHERE value > :threshold", args).await?;

Test plan

• cargo build passes
• cargo test unit tests pass
• cargo fmt -- --check passes