Add functions to fetch Assignment data using Rules on the Configs

[dubdabasoduba]

Describe the feature request.

• The OpenSRP app stores assignment data in the secure shared preferences. We would like to write some methods on the RulesFactory to allow the fetching of this assignment data via rules on the configs
• Each assignment data point should be fetched separately

Acceptance criteria

• Define methods that allow the fetching of the following assignment data
  • Practitioner Id
  • Practitioner Assigned CareTeam(s)
  • Practitioner Assigned Organization(s)
  • Practitioner Assigned Location(s)

Implementation plan (For Engineers)

• Add service methods in the RulesEngineService to fetch the listed assignment data.

• Check the writePractitionerDetailsToShredPref method for the keys used to save the data

  • Practitioner Id
  • Practitioner Assigned CareTeam(s)
  • Practitioner Assigned Organization(s)
  • Practitioner Assigned Location(s)

• Add documentation

[ellykits]

@Raynafs You can access the SharedPreference instance from the injected ConfigurationRegistry