filtering of `geoarrow`-based `ShapeFrame` requires loading into memory

- `point`s are read via `arrow::read_parquet(..., as_data_frame=FALSE)`
- the same command fails for `geoarrow`-based .parquet, unless loading `geoarrow`
- both give different types of `arrow`-objects
  - `point`s natively support `dplyr`-like operations 
  - `shape`s do not, and require realizing data into memory for filtering etc. 