Include JSON type visualization backend support for data mapper

[pasindufernando1]

Purpose

Fixes : wso2/product-ballerina-integrator#2044

[Copilot]

Pull request overview

This PR adds JSON type visualization support to the data mapper backend, enabling the flow model generator to infer and represent JSON structures for data mapping operations. The implementation introduces a new RefJsonType class and extends the DataMapManager to handle JSON type inference from mapping constructor expressions and variable assignments.

Key Changes:

• Introduced RefJsonType class to represent JSON types with field information in the connector model
• Added JSON structure inference logic that analyzes mapping constructors to determine field types
• Extended data mapper to track most recent JSON variable assignments for accurate type inference

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
misc/diagram-util/src/main/java/org/ballerinalang/diagramutil/connector/models/connector/reftypes/RefJsonType.java	New class defining the JSON reference type model with fields and clone support
flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/DataMapManager.java	Core logic for JSON type inference, including MappingJsonPort class, JSON structure inference methods, and assignment tracking
flow-model-generator/modules/flow-model-generator-ls-extension/src/test/java/io/ballerina/flowmodelgenerator/extension/DataMappingModelTest.java	Registered three new test cases for JSON data mapping scenarios
flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/data_mapper_model/source/json.bal	Test source file for JSON-to-record transformation
flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/data_mapper_model/source/json_input.bal	Test source file for JSON module variable input inference
flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/data_mapper_model/source/json_local_input.bal	Test source file for JSON local variable reassignment inference
flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/data_mapper_model/config/json_transform.json	Expected output configuration for record-to-JSON transformation test
flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/data_mapper_model/config/json_input.json	Expected output configuration for JSON module variable input test with diagnostics
flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/data_mapper_model/config/json_local_input.json	Expected output configuration for JSON local variable test

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