chore: Migrate arctan2_op operator to SQLGlot

[jialuoo]

Migrated the arctan2_op operator to SQLGlot.

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Fixes b/447388852 🦕

[jialuoo]

The ibis sql:

SELECT
  atan2(`t0`.`int64_col`, `t0`.`float64_col`) AS `int64_col`
FROM (
  SELECT
    `int64_col`,
    `float64_col`
  FROM `bigframes-dev.sqlglot_test.scalar_types`
) AS `t0`

[chelsea-lin]

Can we add "bool_col" and then compare the Ibis results. Sometime, we may need "CAST(bool_col, INT64)" before calculating "ATAN2"

[jialuoo]

Good point. Fixed.