FINERACT-2410: Rework ProgressiveEMICalculator to work only with DTOs

[a7med3del1973]

Description

Describe the changes made and why they were made. (Ignore if these details are present on the associated Apache Fineract JIRA ticket.)

Checklist

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• Write the commit message as per our guidelines
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• Create/update unit or integration tests for verifying the changes made.
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• Add required Swagger annotation and update API documentation at fineract-provider/src/main/resources/static/legacy-docs/apiLive.htm with details of any API changes
• This PR must not be a "code dump". Large changes can be made in a branch, with assistance. Ask for help on the developer mailing list.

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[airajena]

Please make sure to squash and commit your changes (only 1 commit per PR)

[adamsaghy]

> Task :fineract-progressive-loan:compileTestJava
/home/runner/work/fineract/fineract/fineract-progressive-loan/src/test/java/org/apache/fineract/portfolio/loanproduct/calc/ProgressiveEMICalculatorTest.java:5060: error: [UnusedMethod] Method 'repayment' is never used.
    private static LoanScheduleModelRepaymentPeriod repayment(int periodNumber, LocalDate fromDate, LocalDate dueDate) {
                                                    ^
    (see https://errorprone.info/bugpattern/UnusedMethod)
  Did you mean to remove this line?
/home/runner/work/fineract/fineract/fineract-progressive-loan/src/test/java/org/apache/fineract/portfolio/loanproduct/calc/ProgressiveEMICalculatorTest.java:5070: error: [UnusedMethod] Method 'toScheduleModelPeriodDataList' is never used.
    private static List<ScheduleModelPeriodData> toScheduleModelPeriodDataList(List<LoanScheduleModelRepaymentPeriod> periods) {
              

[adamsaghy]

@a7med3del1973 Please rebase and check the failing checks!