added Paraguay holidays class

lang/paraguay/en/holidays.json

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+{
+    "Año Nuevo": "New Year's Day",
+    "Día de los Héroes": "Heroes' Day",
+    "Día del Trabajador": "Labor Day",
+    "Día de la Independencia Nacional": "Independence Day",
+    "Paz del Chaco": "Chaco Armistice",
+    "Fundación de Asunción": "Founding of Asuncion",
+    "Batalla de Boquerón": "Boqueron Battle Victory Day",
+    "Virgen de Caacupé": "Virgin of Caacupe Day",
+    "Navidad": "Christmas",
+    "Jueves Santo": "Maundy Thursday",
+    "Viernes Santo": "Good Friday"
+}

src/Countries/Paraguay.php

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+<?php declare(strict_types=1);
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Concerns\Translatable;
+use Spatie\Holidays\Contracts\HasTranslations;
+
+final class Paraguay extends Country implements HasTranslations
+{
+    use Translatable;
+
+    public function countryCode(): string
+    {
+        return 'py';
+    }
+
+    public function defaultLocale(): string
+    {
+        return 'es';
+    }
+
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Año Nuevo' => '01-01',
+            'Día de los Héroes' => '03-01',
+            'Día del Trabajador' => '05-01',
+            'Día de la Independencia Nacional' => '05-15',
+            'Fundación de Asunción' => '08-15',
+            'Batalla de Boquerón' => '09-29',
+            'Virgen de Caacupé' => '12-08',
+            'Navidad' => '12-25',
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    private function variableHolidays(int $year): array
+    {
+        $easter = $this->easter($year);
+
+        return [
+            'Paz del Chaco' => $this->chacoArmistice($year),
+            'Jueves Santo'  => $easter->subDays(3),
+            'Viernes Santo' => $easter->subDays(2),
+        ];
+    }
+
+    private function chacoArmistice(int $year): CarbonImmutable
+    {
+        // En 2014, el Día de la Paz del Chaco se trasladó al 16 de junio (Decreto N.º 280 firmado en septiembre del 2013)
+        // Para años posteriores, la fecha se mantiene como el 12 de junio
+        return CarbonImmutable::createFromDate($year, 06, $year === 2014 ? 16 : 12);
+    }
+}

tests/.pest/snapshots/Countries/ParaguayTest/it_can_calculate_paraguayan_holidays.snap

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+[
+    {
+        "name": "A\u00f1o Nuevo",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "D\u00eda de los H\u00e9roes",
+        "date": "2024-03-01"
+    },
+    {
+        "name": "Jueves Santo",
+        "date": "2024-03-28"
+    },
+    {
+        "name": "Viernes Santo",
+        "date": "2024-03-29"
+    },
+    {
+        "name": "D\u00eda del Trabajador",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "D\u00eda de la Independencia Nacional",
+        "date": "2024-05-15"
+    },
+    {
+        "name": "Paz del Chaco",
+        "date": "2024-06-12"
+    },
+    {
+        "name": "Fundaci\u00f3n de Asunci\u00f3n",
+        "date": "2024-08-15"
+    },
+    {
+        "name": "Batalla de Boquer\u00f3n",
+        "date": "2024-09-29"
+    },
+    {
+        "name": "Virgen de Caacup\u00e9",
+        "date": "2024-12-08"
+    },
+    {
+        "name": "Navidad",
+        "date": "2024-12-25"
+    }
+]

tests/Countries/ParaguayTest.php

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+<?php
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Holidays;
+
+it('can calculate paraguayan holidays', function (): void {
+    CarbonImmutable::setTestNow('2024-01-01');
+
+    $holidays = Holidays::for(country: 'py')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+});
+
+it('can get holidays in another locale', function (): void {
+    CarbonImmutable::setTestNow('2024-01-01');
+
+    $holidays = Holidays::for(country: 'py', locale: 'en')->get();
+
+    expect($holidays[0]['name'])
+        ->toBe("New Year's Day");
+});
+
+it('can calculate Chacho Armistice holiday', function (int $year, int $valid_day, int $invalid_day): void {
+    CarbonImmutable::setTestNow("$year-01-01");
+
+    expect(Holidays::for('py')->isHoliday("$year-06-$valid_day"))->toBeTrue()
+     ->and(Holidays::for('py')->isHoliday("$year-06-$invalid_day"))->toBeFalse();
+})->with([
+    [2012, 12, 16],
+    [2013, 12, 16],
+    [2014, 16, 12],
+    [2015, 12, 16],
+    [2016, 12, 16],
+    [2024, 12, 16],
+]);