Mapchete

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* core

* `commands.execute()`: avoid reporting on exception twice; send notification message on details of retry attempt (614)
* `settings.IORetrySettings`: add ServerDisconnectedError and FSTimeoutError to retryable exceptions (615)
* `executor.future.MFuture`: keep CancelledError from dask instead of wrapping it within a MapcheteTaskFailed (615)
* `commands.index()`: add FlatGeobuf as index driver (616)


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* core

* determine `FileNotFoundError` directly in `rasterio_read` (613)
* add `Status.pending` (613)


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* core

* catch dask exception if task exception cannot be retreived and wrap it within `MapcheteTaskFailed` (612)


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* core

* fix `"type"` `DeprecationWarning` with old `BufferedTilePyramid` parameters (611)
* add `MPath.read_json()`, `MPath.write_json()`, `MPath.read_yaml()` and `MPath.write_yaml()` methods (611)
* explicitly set exception types to be retried in `mapchete.settings.IORetrySettings` (611)
* `mapchete.commands.index`: enable indexing from a `TileDir` input (611)
* `MPapth`: set rasterio environment `GDAL_DISABLE_READDIR_ON_OPEN='EMPTY_DIR'` when opening STACTA or VRT


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* core

* introduce `GridProtocol` to replace `tile` argument in raster read functions (610)
* use `Concurrency.none` per default, except in CLI (610)


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* core

* add `processing.types.LazyTaskInfo` to avoid calling `Future.result()` unnecessarily (608)
* do not keep futures around when submitting a task graph to enable dask to release finished tasks (608)
* also apply `settings.MapcheteIOSettings` to `path.MPath.read_text()` (609)
* add optional `DaskSpecs` to mapchte configuration schema (609)


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