feat: IntelliJ plugin

[ammokhov]

Issue #, if available:

Description of changes:

IntelliJ Plugin for Resource Schema Guard Rail

Overview

IntelliJ plugin that provides real-time validation for CloudFormation resource schema files using the Resource Schema Guard Rail CLI tool.

Features

1. Stateless Linter (Automatic)

• Real-time validation as you edit JSON schema files
• Inline error highlighting with detailed tooltips showing rule violations
• Problems tool window integration for easy navigation to issues
• Status bar widget displaying error and warning counts
• Runs automatically on file save using guard-rail --schema file://path --json

2. Stateful Validation (Manual)

• Gutter icon ("Run Checks" button) at line 1 of JSON schemas
• Compares local schema with CloudFormation-registered schema
• Fetches registered schema via CloudFormation DescribeType API using typeName from local file
• Runs guard-rail --schema file://retrieved --schema file://local --stateful --format
• Output panel displays formatted validation results with breaking change detection
• Saves temporary files and logs in project directory

Architecture

• GuardRailAnnotator: External annotator for real-time diagnostics
• GuardRailCliExecutor: Centralized CLI execution with executeStateless() and executeStateful() methods
• GuardRailGutterIconProvider: Clickable gutter icon for stateful validation
• CloudFormationSchemaFetcher: Retrieves registered schemas from AWS

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[pultormi]

This is a bit odd. Seems like in buildJsonOutput we serialize this back into a json string then in mapResults we deserialize it back to a guard rail result