WIP: Add ZarrTIFFWSIReader class.

[aacic]

The ZarrTIFFWSIReader reads fsspec json file which represents SVS wsi.
The methods: read_rect, read_bounds, _canonical_shape are copied from TIFFWSIReader, and it needs to be improved by introducing delegates or some other way.

The method infor reads SVS metadata which is stored in the root group metadata like:

{
  ".zattrs": {
    "multiscales": [
      {
        "metadata": {
          "objective_power": 40,
          "vendor": "Aperio",
          "mpp": [0.2525, 0.2525]	
        }
      }
    ]
  }
}

To test, execute from the root dir:

pip install -r requirements/requirements_dev.txt
mkdir -p samples/slides
mkdir -p samples/fsspec
cd samples/slides
curl -C - -o TCGA-22-1017-01Z-00-DX1.9562FE79-A261-42D3-B394-F3E0E2FF7DDA.svs   https://api.gdc.cancer.gov/data/73c69d24-6f9e-44e2-bfe5-a608d4cf5c27
cd ../../tests/zarrtiff/
python tiff_fsspec.py "../../samples/slides/TCGA-22-1017-01Z-00-DX1.9562FE79-A261-42D3-B394-F3E0E2FF7DDA.svs"  "../../samples/fsspec/73c69d24-6f9e-44e2-bfe5-a608d4cf5c27_fsspec.json" "https://api.gdc.cancer.gov/data/73c69d24-6f9e-44e2-bfe5-a608d4cf5c27"

Change the svs variable inside of tileserver.py to:

svs = "../../samples/fsspec/73c69d24-6f9e-44e2-bfe5-a608d4cf5c27_fsspec.json"

python tileserver.py

Open http://127.0.0.1:5000/ and verify how it works.

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