[R] Add GeoParquet reader implementation

[paleolimbot]

Like the previous geoarrow, we should provide read_geoparquet() (which reads to data.frame with geometry as geoarrow_vctr) and read_geoparquet_sf() (which reads directly to sf). I believe the current geoarrow is set up better to handle this (or will be following #83), and there is a Python implementation to draw on which has pretty good coverage of the possible GeoParquet permutations: https://github.com/geoarrow/geoarrow-python/blob/main/geoarrow-pyarrow/src/geoarrow/pyarrow/io.py#L84-L189