Migrate vscode extension + test infrastructure to ESM

[fey101]

Is your feature request related to a problem? Please describe the problem.

No response

Client library/SDK language

TypeScript

Describe the solution you'd like

Current infrastructure for vscode extension is based off commonjs as appears here https://github.com/microsoft/kiota/blob/main/vscode/microsoft-kiota/tsconfig.json#L4. We would like to experiment with moving the project to using ESM modules instead.

This was brought about as a result of a PR review as appears in this comment #5540 (comment)

Additional context

No response

[baywet]

As additional information for other readers, migrating to ESM will ensure better compatibility with upcoming updated packages, or additional packages we might want to add. It'll also guarantee better reliability as mixing package types is a common source of breakages. It might also reduce javascript size and improve loading performance.