Add DocumentDB support in .NET Aspire

### Is there an existing issue for this?

- [x] I have searched the existing issues

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

I am trying to reduce the complexity of my ASP.NET application by consolidating PostgreSQL and MongoDB into a single database technology. DocumentDB (from Microsoft) extends PostgreSQL with document capabilities. I would like to configure it through .NET Aspire in the same way I configure other data providers (like standard PostgreSQL or MongoDB). Currently, there's no built-in Aspire integration or guidance for DocumentDB.

### Describe the solution you'd like

I'd love to see official support or documentation for configuring DocumentDB in .NET Aspire, ideally in a way that:
- Mirrors the or extends the existing PostgreSQL integration, since DocumentDB is effectively an extension of PostgreSQL.
- Helps .NET developers use DocumentDB's document capabilities quickly.
- Includes instructions or samples in the .NET Aspire docs for easy setup.

### Additional context

- Many developers already use .NET Aspire for straightforward PostgreSQL and MongoDB setups.
- DocumentDB is open-sourced by Microsoft and could provide a “one database” approach that still supports document-based features.
- I am currently using both PostgreSQL and MongoDB in production, and I'd like to experiment with dropping MongoDB in favor of DocumentDB + PostgreSQL, all managed via Aspire if possible.
- DocumentDB Open-Source announcement: https://opensource.microsoft.com/blog/2025/01/23/documentdb-open-source-announcement/
- DocumentDB github repo: https://github.com/microsoft/documentdb