Inconsistency in getMonth and setMonth Methods

[SoheilHasankhani]

The getMonth method is currently working with the Jalali month, while the setMonth method operates with the Gregorian month. This inconsistency leads to a failure in the following simple test:

it("Jalaali -- setAndGetMonth", () => {
    const date = jalaaliUtils.date(TEST_TIMESTAMP);
    const newDate = jalaaliUtils.setMonth(date, 0);
    expect(jalaaliUtils.getMonth(newDate)).toBe(0);
});

The getDate method has been overridden to work with jDate:

public getMonth = (date: Moment) => {
    return date.jMonth();
};

However, the setDate method has not been adjusted to match this behavior. This inconsistency needs to be addressed to ensure the correct functioning of the library.

[dmtrKovalenko]

Does it only affect moment jalaali? Could you please submit a PR with a test to fix this behavior as you already did?

[dmtrKovalenko]

closed by #661