Replace CDSE OpenSearch with OData API

**Describe the requested improvement**
As stated in the [CDSE documentation](https://documentation.dataspace.copernicus.eu/APIs/OpenSearch.html), the OpenSearch Endpoint will be decommissioned on March 02. We need to replace it with the OData API to keep providing access to the Sentinel-1 products.

**Associated sits API function**
`sits_cube()`

**Additional context**
N/A
