Escape special characters for fieldNames in jsonToType mapper

[pasindufernando1]

Purpose

$subject
Fixes : wso2/product-ballerina-integrator#979

This PR will address the issue of the fieldNames which contain special characters not being properly escaped that leads to invalid types.

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[Copilot]

Pull request overview

This PR aims to fix generation of invalid Ballerina types when JSON-derived record field names contain special characters by ensuring identifiers are escaped during source generation.

Changes:

• Updated SourceCodeGenerator to escape record field identifiers using escapeIdentifier(...) instead of only escaping reserved keywords.
• Added a new types-manager create/update test config covering field names with + and -.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/utils/SourceCodeGenerator.java	Escapes generated record field names to support special characters in identifiers.
flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/types_manager/create_and_update/config/create_record_type4.json	Adds regression coverage for record fields named +1 and -1 expecting escaped identifiers in generated output.

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