i.sentinel.download: use EODAG as a unified API for downloading sentinel products (#1150)

* Initial structure for i.sentinel.download.py

* Implement b flag

* Add scenes listing

* Set default output option to current working directory

* Add s flag

* Use temp file to download scenes

* Remove S2 MSI L2A pilot version

* Handle products with no cloud coverage percentage

* Add footprint to sort options

* Add query option

* Rename uuid option to id

* Add settings option to be used for credentials

* Remove eodag config file existence check

* Add scene size to listing

* Reformat listing output

* Add GRDCOG to support S1_SAR_GRD_COG

* Patch listing format

* Update description section

* Update examples section

* Add listing when using search by ID

* Reimplement p flag

* Update header

* Make use of the eodag config file credentials

* Map the retry and sleep options to eodag wait and timeout options

* Remove deprecated products from options

Author: HamedElgizery