refactor: migrate from nunjucks to react-sdk for code generation and handle curly-braces in operationID (#386)

* Migration from nunjucks to react-sdk for code generation

Broadly, the code changes covers the following:
- Efficient schema handling and class generation (for both JSON and AVRO)
- Support for complex JSON and AVRO schema (inheritences, nested objects and complex schema settings)
- Support for schema settings around field formats, constraints etc
- Proper binder configuration (for Solace, Kafka and RabbitMQ)
- Solace-specific: Queue/Topic handing in the binding configuration
- Revamped integration.test with support scripts for generating code from asyncapi files in mocks and compiling the generated code, generate report
- Support for all the template parameters and x-* custom overrides

* Update to README with information on how to use test scripts and integration test

* Updated README with info to enable debug logging

* Handled a case where the operationID contains curly-braces {}

* fix: resolve eslint errors for upstream PR compatibility

- Add missing toJavaClassName import in ApplicationYml.js
- Fix duplicate 'properties' key in avroProcessor.js (renamed to propertiesArray)
- Move ModelClass definition before SchemaModel to fix use-before-define
- Refactor nested ternary expressions into helper functions
- Fix brace-style issues (else-if on same line)
- Fix lonely-if by converting to else-if chain
- Add radix parameter to parseInt()
- Prefix intentionally unused variables with underscore
- Remove unused destructured variables in coreProcessor.js
- Update .eslintrc to ignore vars/args prefixed with underscore
- Add .eslintignore to exclude build artifacts

* Reduce code duplication to meet SonarQube <3% threshold

- Create utils/processorUtils.js with shared processor functions
- Create utils/schemaModel/BaseSchemaModel.js for common schema logic
- Create utils/packageUtils.js for AVRO package extraction
- Refactor avroProcessor and jsonProcessor to use shared utilities
- Refactor hooks/pre-process.js and post-process.js
- Add helper functions to components/Application.js
- Add test/run_output.sh script for running generated projects

Author: gvensan

.eslintignore

@@ -0,0 +1,4 @@
+__transpiled/
+node_modules/
+test/output/
+test/temp/

.eslintrc

@@ -40,7 +40,7 @@ rules:
   no-empty-character-class: 2
   no-self-compare: 2
   valid-typeof: 2
-  no-unused-vars: [2, { "args": "none" }]
+  no-unused-vars: [2, { "args": "none", "varsIgnorePattern": "^_", "argsIgnorePattern": "^_" }]
   handle-callback-err: 2
   no-shadow-restricted-names: 2
   no-new-require: 2

.gitignore

@@ -1,5 +1,9 @@
 node_modules
 test/temp
+test/output
 coverage
 **/.DS_Store
-**/.vscode
+**/.vscode
+__transpiled
+**/__transpiled
+samples/