Support for integer EPSG code as crs

[soxofaan]

Reported here https://discuss.eodc.eu/t/batch-job-vito-error/214/2 and I'm sure it has been reported before but I can't seem to find the ticket.

the openEO spec of filter_bbox states that the crs can be given as an integer EPSG code, but VITO backend does not accept that:

cube = (
    con.load_collection("CGLS_LAI300_V1_GLOBAL")
    .filter_bbox({
         "west": 16.13, "east": 16.52, "north": 48.32, "south": 48.13,
         "crs": 4326
    })
    .filter_temporal([ "2020-09-01", "2020-09-15"])
)
cube.download()

->
OpenEoApiError: [500] unknown: An error occurred while calling o40914.setGlobalExtent. Trace:
py4j.Py4JException: Method setGlobalExtent([class java.lang.Double, class java.lang.Double, class java.lang.Double, class java.lang.Double, class java.lang.Integer]) does not exist

[JeroenVerstraelen]

Open-EO/openeo-python-driver@8608d5b