Add esm support

[dzhukovsky]

This pull request introduces significant improvements to the build process and module packaging for the project, focusing on better support for ESM (ECMAScript Modules) output and more robust package exports. The changes include updates to the build script to generate both CommonJS and ESM outputs, automated generation of the exports field in package.json, and dependency updates. These enhancements will make the package easier to consume in both Node.js and modern JavaScript environments.

Build and packaging improvements:

• Updated buildpackage.js to clean both bin/ and esm/ directories, compile TypeScript for both CommonJS and ESM targets, move ESM output to bin/esm, and create an ESM-specific package.json. Also updated minification logic to skip ESM files. [1] [2] [3]
• Added a new script generateExports.js to automatically generate the exports field in package.json based on the structure of the src/ directory, ensuring correct module resolution for both ESM and CommonJS consumers.
• Added tsconfig.esm.json to configure TypeScript compilation for ESM output.

Project configuration and dependency updates:

• Set "type": "module" in package.json and added new npm scripts for preparing and generating exports. Also added azure-devops-extension-sdk as a dependency. [1] [2]

Code style consistency:

• Updated import style in src/Boards/BoardsClient.ts to use import * as Boards for consistency with ESM.

[dzhukovsky]

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