FINERACT-2632: Add missing fields to Clients Swagger spec for type-safe Feign client generation

[DeathGun44]

Description

Adds missing fields to PostClientsRequest (submittedOnDate), PostClientsClientIdRequest (withdrawalDate, withdrawalReasonId, reopenedDate), and PutClientsClientIdRequest (firstname, lastname) so the generated Feign client models match what the server actually accepts.

Blocks: FINERACT-2631

Checklist

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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
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[DeathGun44]

the test just timed out ,re-running should make it pass