[GR-57592] Implement Decorator Metadata Proposal

### TL;DR

We plan to implement the [Decorator Metadata](https://github.com/tc39/proposal-decorator-metadata) proposal in GraalJS.

### Details

This proposal seeks to extend the [Decorators](https://github.com/tc39/proposal-decorators) proposal by adding the ability for decorators to associate _metadata_ with the value being decorated.