fix: updated DocumentApiFixed.java to resolve streaming in document api

[charmainesekulane232]

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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[charmainesekulane232]

This PR updates the DocumentsApiFixed class within the fineract-client module. The changes address streaming issues in the document API by implementing latches, which ensures better synchronization and prevents potential crashes during high-concurrency data handling