feat(optimizer)!: Annotate COS for DuckDB (#6893)

Author: AbhishekASLK

sqlglot/typing/duckdb.py

@@ -14,6 +14,7 @@
     **{
         expr_type: {"returns": exp.DataType.Type.DOUBLE}
         for expr_type in {
+            exp.Cos,
             exp.Sin,
         }
     },

tests/fixtures/optimizer/annotate_functions.sql

@@ -5598,4 +5598,12 @@ DOUBLE;
 
 # dialect: duckdb
 SIN(tbl.double_col);
+DOUBLE;
+
+# dialect: duckdb
+COS(tbl.int_col);
+DOUBLE;
+
+# dialect: duckdb
+COS(tbl.double_col);
 DOUBLE;