Support all available period types in DHIS2

Currently, the DHIS Connector Module supports only the following period types,

• Daily
• Weekly
• Monthly

The goal is to support the following period types:

1. Daily
2. Weekly: 
3. Monthly: Refers to standard calendar months.
4. BiMonthly: Two-month periods beginning in January.
5. Quarterly: Standard ISO quarters, beginning in January.
6. SixMonthly: Six-month periods beginning in January
7. Yearly: This refers to a calendar year.
8. Financial April: Financial year period beginning on April 1st and ending on March 31st of the calendar next year
9. Financial July: Financial year period beginning on July 1st and ending on June 31st of the calendar next year
10. Financial Oct: Financial year period beginning on October 1st and ending on September 31st of the calendar next year
11. Six-monthly April: Six-month periods beginning on April 1st with a duration of six calendar months.

 https://docs.dhis2.org/2.22/en/user/html/ch03s04.html