Calculate accountability end date

[Wambere]

Add functionality to calculate the accountability date using the product's accountability period

IMPORTANT: Where possible all PRs must be linked to a Github issue

Fixes #264

Engineer Checklist

• I have run ./gradlew spotlessApply to check my code follows the project's style guide
• I have built and run the efsity jar to verify my change fixes the issue and/or does not break the application

[Wambere]

@peterMuriuki is this date format assumption correct? or should we make this a parameter?

[peterMuriuki]

yeah that looks correct, The format is YYYY, YYYY-MM, YYYY-MM-DD or YYYY-MM-DDThh:mm:ss+zz:zz,

ref: https://www.hl7.org/fhir/R4/datatypes.html#dateTime

[Wambere]

@peterMuriuki I was thinking more inline of the csv. Since those are not necessarily coming from the server
Unless someone exports the resources.
I'll create a separate issue to extend this just in case

[peterMuriuki]

probably better to use the code.coding.system and code.coding.code, since those are less likely to be moving targets.

export const smartRegisterCodeSystem = 'http://smartregister.org/codes';
export const accountabilityCharacteristicCode = '67869606';

export const accountabilityCharacteristicCoding = {
  system: smartRegisterCodeSystem,
  code: accountabilityCharacteristicCode,
  display: 'Accountability period (in months)',
};