Description

Extends the RestAssured → Feign migration (PR 3 of the roadmap) to the Charges and Delinquency domains.
Key Changes:

• Added ChargeRequestBuilders: Static typed factories for ChargeRequest generation.
• Added FeignChargesHelper: 14 pure-Feign methods for global (ChargesApi) and client-level (ClientChargesApi) charge management.
• Added FeignDelinquencyLifecycleTest: 7 ordered E2E tests verifying delinquency range/bucket CRUD via native Feign.
• Fixed Swagger Spec: Added 4 missing withdrawal fields to PostChargesRequest in ChargesApiResourceSwagger, ensuring ChargeRequest generation is accurate for PUT requests.
• Refactored Tests: Swapped duplicated legacy createCharge() logic in 3 enricher/report tests with the new chargesHelper.createLoanDisbursementCharge().
  Note: LoanChargesApi actions (add/pay/waive on specific loans) and Loan Delinquency actions are deferred to the upcoming FeignLoanHelper PR.

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