feat(web-client): Recurring payments feature.

[IscoRuta98]

Implementation of Frontend Recurring Payment feature.

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[billguo99]

Nice, just a few minor feedback:

• Can you remove the console.log that's not in error blocks?
• When inputting the days for frequency, can you indicate somewhere that the value for the frequency is in days?

One more fix:

• I saw the date values that you're saving to mongodb is basically Unix timestamp int values.

You'll need to use the following typescript function to convert a Date object to their ordinal value:

const _DAYS_IN_MONTH: number[] = [-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

function isLeapYear(year: number): boolean {
    // year -> 1 if leap year, else 0.
    return year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0);
}

function getDateToOrdinal(date: Date): number {
    const year = date.getFullYear();
    const month = date.getMonth() + 1;
    const day = date.getDate();

    return (
        (year - 1) * 365 +
        Math.floor((year - 1) / 4) -
        Math.floor((year - 1) / 100) +
        Math.floor((year - 1) / 400) +
        _DAYS_IN_MONTH.slice(1, month).reduce((acc, curr) => acc + curr, 0) +
        (month > 2 && isLeapYear(year) ? 1 : 0) +
        day
    );
}

[billguo99]

NICE!