Support R for Windows

### What happens?

What would it take to build binaries that can be used in R for Windows?

The spatial extension seems to work already: https://github.com/duckdb/duckdb-r/issues/23#issuecomment-1985276933

This extension can be made to work too, it seems: https://github.com/duckdb/duckdb-r/issues/23#issuecomment-2002374602

CC @elysabethpc.

CC @Maxxen (re: https://github.com/duckdb/duckdb-r/issues/100#issuecomment-1980517821)

### To Reproduce

```r
con <- DBI::dbConnect(duckdb::duckdb())
DBI::dbExecute(con, "install postgres_scanner;")
```

### OS:

Windows

### PostgreSQL Version:

?

### DuckDB Version:

0.10.0

### DuckDB Client:

R

### Full Name:

Kirill Müller

### Affiliation:

cynkra GmbH

### Have you tried this on the latest `main` branch?

- [X] I agree

### Have you tried the steps to reproduce? Do they include all relevant data and configuration? Does the issue you report still appear there?

- [X] I agree