Added commands to manage iTwin Shares

[linasburneika]

• Added commands to manage iTwin Shares: create, info, list, revoke
• minor improvement to use Native client provided with environment variables
• fixed error formatting in local implementation of iTwin platform API client

[Copilot]

Pull Request Overview

This PR adds comprehensive iTwin Share management functionality to the CLI tool by implementing four new commands: create, info, list, and revoke. The changes include underlying service infrastructure, API client methods, and comprehensive integration tests to support managing iTwin shares through the command line interface.

• Added complete iTwin Share management commands (create, info, list, revoke)
• Enhanced configuration to support native client credentials from environment variables
• Fixed error handling in the iTwin platform API client for better error reporting

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/services/iTwin-platform-api-client.ts	Improved error handling with better content-type checking and formatting
src/services/access-control/models/itwin-share.ts	Added TypeScript interfaces for iTwin Share data models
src/services/access-control/access-control-service.ts	Added service methods for iTwin Share operations
src/services/access-control/access-control-client.ts	Added API client methods for iTwin Share endpoints
src/extensions/configuration.ts	Enhanced to support native client configuration
src/commands/itwin/share/*.ts	Implemented all four iTwin Share command handlers
integration-tests/itwin/share.test.ts	Added comprehensive integration tests
docs/itwin/share/*.md	Added documentation for all new commands
.vscode/launch.json	Fixed file path separators for cross-platform compatibility

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}