unit tests

[ptresson]

• [x] algorithms init and processing with default values
• [x] timm model creation
• [ ] pass different set of parameters
• [ ] quantization
• [x] RasterDataset init
• [ ] rasterio merge ?
• [ ] different proj and clustering methods

[ptresson]

cf. aa5b9c481d7b64766b1c8e27d54ef5efddc400f0 to 1ae21e65c31119cb8308763496449e601f842736 for algorithm init and model creation

[ptresson]

init RasterDataset with c877e893c9c44a8466ba20690d4635088f8b19ef