Adds valid height check for DEM intersection

## Unreleased

### Changed

- Removed all `pyproj` calls from csm.py, abstracting them into the reprojection and pyproj.Transformer code inside utils.py. Updated the transformations to use the new pipeline style syntax to avoid deprecation warnings about old syntax.p

- Removed all `pyproj` calls from csm.py, abstracting them into the reprojection and pyproj.Transformer code inside utils.py. Updated the transformations to use the new pipeline style syntax to avoid deprecation warnings about old syntax.

### Fixed

- Added a check to `generate_ground_point` when a GeoDataset is used to raise a `ValueError` if the algorithm intersects a no data value in the passed DEM. This ensures that valid heights are used in the intersection computation.

        px, py = dem.latlon_to_pixel(lat, lon)

        height = dem.read_array(1, [px, py, 1, 1])[0][0]

        if height == dem.no_data_value:

            raise ValueError(f'No DEM height at {lat}, {lon}')

        next_intersection = camera.imageToGround(image_pt, float(height))

        dist = max(abs(intersection.x - next_intersection.x),