Ingest more bands for L8 products

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We are currently handling only one band for L8 products. Improve L8 operators and DAGs in order to search, download, process and publish multiple bands. List of bands to process should be set as a configuration parameter

• [ ] Search and Download should already support multiple bands. Test it and improve it to allow configurable list of bands
• [ ] Improve the GDALTranslate operator to have XCom pull parameters as parameters to the operator (look ad GDALAddoOperator as example: https://github.com/geosolutions-it/evo-odas/blob/master/airflow/plugins/gdal_plugin.py#L114)
• [ ] Improve the "landsat8_translate_daraa_task" and "landsat8_addo_daraa_task" to support multiple bands. This can be achieved using a SubDAG as we did for Sentinel1 (https://github.com/geosolutions-it/evo-odas/blob/master/airflow/dags/sentinel1/s1_grd_subdag_factory.py)
• [ ] Improve product_json_task, product_thumbnail_task, product_thumbnail_task and product_description_task and product_zip_task as needed to add support multiple bands