vcpkg duckdb feature support for spatial

Hi @Maxxen, I noticed that this specific extension isn't supported as a feature in [microsoft's vcpkg duckdb feature list](https://github.com/microsoft/vcpkg/blob/master/ports/duckdb/vcpkg.json#L18).
Is this due to the extension still being classified as [experimental](https://duckdb.org/docs/stable/core_extensions/overview#list-of-core-extensions)?
I've tried to add it as a custom port feature similar to the other features by updating the [portfile.cmake](https://github.com/microsoft/vcpkg/blob/master/ports/duckdb/portfile.cmake#L51) and vcpkg.json with the following.
```cmake
if("spatial" IN_LIST FEATURES)
vcpkg_from_github(
OUT_SOURCE_PATH DUCKDB_SPATIAL_SOURCE_PATH
REPO duckdb/duckdb-spatial
REF 2d2cc451e35073e738330eb95550a3eba88ca022
SHA512 216a0325237a695b44bfb5daea62096132c8727a360c7de517319527cebc1b9f672215b20b8f4dcab5929d8fb1a12c92e7a94a5901848f59c128ee87f230d579
HEAD_REF main
)
file(RENAME "${DUCKDB_SPATIAL_SOURCE_PATH}" "${SOURCE_PATH}/extension/spatial")
endif()

string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "static" DUCKDB_BUILD_STATIC)
string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "dynamic" DUCKDB_BUILD_DYNAMIC)

set(EXTENSION_LIST "autocomplete;excel;httpfs;icu;json;spatial;tpcds;tpch")
```

However, I get a lot of errors relating to
```
buildtrees/duckdb/src/v1.4.1-61c1f2c740.clean/src/include/duckdb/main/extension_util.hpp:7:15: error: static assertion failed: The DuckDB 'ExtensionUtil' class has been removed, see this PR for more details: https://github.com/duckdb/duckdb/pull/17772
```
And a lot of api calls to ```ExtensionUtil::RegisterCastFunction(...```.

Do you know what the resolution is for these errors, and/or is there a timeline for when the spatial feature would be added to vcpkg?

Thanks