FINERACT-2240: migrate Charges to CommandDispatcher

[aditinikam]

Migrate the charge definition module (/v1/charges) to the typed command-processing infrastructure, removing the legacy JsonCommand write path entirely (CQRS-only), following the conventions established by the Staff and Floating Rate modules.

Write path

• ChargesApiResource POST/PUT/DELETE build typed Charge{Create,Update, Delete}Command and dispatch through CommandDispatcher, returning typed responses; the update response still carries the changes map
• add ChargeWriteService(+Impl), typed command handlers and request / response DTOs under portfolio.charge.data
• applyChanges() lives in the write service rather than on the entity, so the entity no longer consumes DTOs; Charge.fromJson and Charge.update(JsonCommand) are gone
• delete ChargeWritePlatformService(+Impl), the @CommandType handlers, the JSON deserializer and the CommandWrapperBuilder charge methods

Validation

• the programmatic deserializer is replaced by declarative Jakarta Bean Validation: field constraints on the request DTOs plus the class-level @ValidChargeCreate / @ValidChargeUpdate constraints for the cross-field and chargeAppliesTo-driven rules
• ChargeUpdateValidator is repository-backed because the legacy path validated the charge state after the update had been applied; it now validates the merged (post-update) values instead
• messages live in fineract-validation ValidationMessages.properties

Read path

• ChargeReadPlatformService is renamed to ChargeReadService, the inline permission checks are dropped and read authorization moves to SecurityConfig matchers alongside the write ones

The generated client models follow the typed signatures, so the charge operations in the integration and end-to-end tests are updated to ChargeCreateRequest / ChargeCreateResponse / ChargeUpdateRequest / ChargeUpdateResponse / ChargeDeleteResponse / ChargeData. The previously undocumented template query parameter of GET /charges/{chargeId} is now part of the API contract.

Description

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

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