Dem-stitcher

* Multithreading for windowed reading during merge operation
* Add 3.12 support
* Introduce ruffformatting - i.e. add ruff workflow to actions for static analysis and reformat python files.
* Provide separate progress bar for opening dataset, reading tile metadata, and reading tile array.
* Supresses: `RuntimeWarning: invalid value encountered in intersection` from `shapely`

* Fix urls found in pyproject.toml so they correctly link on PyPI

* Updated license in pyproject.toml that was causing pypi to reject upload

Changed
* Updated environment.yml and pyproject.toml for modern build of wheels
* Updated github actions to tie to specific version of ASF resuable workflows
* Included dependabot.yml

Changed
* Update `merge_tile_datasets_within_extent` (formely named `merged_tile_datasets`) to only read data within provided extents
* Requires `extent` (i.e. `list[float]`) as input now.
* Internally, swap use of m x n arrays (with total dimensions 2) to the 3 dimensional arrays c x m x n. Specifically, use
band interleaved by pixel (BIP) format where c is the number of channels. Although the API remains
unchanged (outputs 2 dimensional array), the intermediate functions are slightly more general and applicable.
* merged.py - all functions now accept BIP (3d arrays) and return them
* geoid.py - all functions return and expect BIP (3d arrays) including the input dem array.
* Improved performance of merge by reading only the extent that is required.
* Typing for 3.9+
* Use pyproject.toml for installation.

Added
* Support for 1/3 arc second 3Dep
* Tests using golden datasets and mocked tiles/geoid - ensures correctness of transformations

Removed
* Support for NED1 and 3Dep 1 arcsecond
* Support for Python 3.7 and 3.8
* setup.py

Added
- The function `get_dem_tile_paths` to extract urls or local paths to dem tiles specifying bounds and dem names.
- Notebook illustrating how to create a `vrt` file using `get_dem_tile_paths`.
- Utilizes `get_dem_tile_paths` in main `stitch_dem` for easier testing.
- Caches dem tile extents loaded from compressed geojson.

Removed
- `driver` keyword in `stitch_dem`.