Refactor Australia holidays

[KJhellico]

Proposed change

• Refactor some Australia holidays
• Add Anzac Day to InternationalHolidays

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new python-holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've added references to all holidays information sources used in this PR
• The code style looks good: make pre-commit command generates no changes
• All tests pass locally: make test, make tox (we strongly encourage adding tests to your code)

[coveralls]

Pull Request Test Coverage Report for Build 6625701209

• 12 of 12 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.978%

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Totals
Change from base Build 6620987603:	0.0%
Covered Lines:	10066
Relevant Lines:	10066

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💛 - Coveralls

[PPsyrius]

@KJhellico Would it be possible to convert (APR, 25) to self._add_anzac_day(name) too? I happen to be working on Tonga public holidays implementation at the moment, and they also celebrate Anzac Day over there (Samoa also had that as a Public Holiday up until 2008).

    def _add_anzac_day(self, name):
        """
        Add Anzac Day (April 25th)

        Anzac Day is a national day of remembrance in Australia and New Zealand
        that broadly commemorates all Australians and New Zealanders "who
        served and died in all wars, conflicts, and peacekeeping operations"
        and "the contribution and suffering of all those who have served".

        Anzac Day is a public holiday in Australia, New Zealand, and Tonga; as
        well as a public holiday in Samoa up until 2008.
        https://en.wikipedia.org/wiki/Anzac_Day
        """
        return self._add_holiday_apr_25(name)

[KJhellico]

@PPsyrius , thank for your suggestion! I remember seeing this holiday in some countries in Oceania. :)

[arkid15r]

Nice work getting rid of date/td imports!

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[arkid15r]

LGTM