FINERACT-2421: Loan product basic detail endpoint

[alberto-art3ch]

Description

In order to have a Loan account application considering the Loan and Working Capital products supported now, we are adding a Loan product basic details endpoint to fetch those available products to be listed

FINERACT-2421

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[adamsaghy]

Create a new interface (like LoanProductReadBasicDetailsService) in the fineract-loan module which has the retrieveProducts() method.

Lets have 2 implementation of this interface:

1. in fineract-loan module which return those loan products
2. in fineract-working-capital-loan module which return those loan products

This class also can be moved into fineract-loan module.

We dont need to explicitly inject LoanProductReadPlatformService and WorkingCapitalLoanProductReadPlatformService.

Lets inject List of the newly created interface:

private final List<LoanProductReadBasicDetailsService> loanProductReadBasicDetailsServices;
...
loanProductReadBasicDetailsServices.foreach( service -> products.addAll(service.retrieveProducts());

We dont need to put anything into fineract-provider module.

[adamsaghy]

Please see my concerns!