MINIFICPP-2595 Create ConvertRecord processor

[lordgamez]

https://issues.apache.org/jira/browse/MINIFICPP-2595

Depends on #1995

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[Copilot]

Pull Request Overview

This PR creates a new ConvertRecord processor that converts records from one data format to another using configured Record Reader and Record Writer Controller Services. The implementation provides a standard pattern for record format conversion in the Apache NiFi MiNiFi C++ framework.

• Implementation of a complete ConvertRecord processor with input validation and error handling
• Comprehensive unit test coverage including success, failure, and edge cases
• Integration test setup with controller services and feature testing

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
extensions/standard-processors/processors/ConvertRecord.h	Header file defining the ConvertRecord processor class with properties, relationships, and output attributes
extensions/standard-processors/processors/ConvertRecord.cpp	Implementation of the ConvertRecord processor including scheduling validation and record conversion logic
extensions/standard-processors/tests/unit/ConvertRecordTests.cpp	Unit tests covering processor validation, conversion success/failure scenarios, and zero record handling
docker/test/integration/minifi/processors/ConvertRecord.py	Integration test wrapper for the ConvertRecord processor
docker/test/integration/minifi/controllers/XMLReader.py	Integration test wrapper for XMLReader controller service
docker/test/integration/features/steps/steps.py	Step definition for setting up XMLReader controller service in integration tests
docker/test/integration/features/core_functionality.feature	Integration test scenario for XML to JSON record conversion
PROCESSORS.md	Documentation for the ConvertRecord processor including properties, relationships, and attributes

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