automatically pass through context to UDF from parent process

[soxofaan]

related to

• Context parameter in openeo.UDF.from_file() causes confusion #520
• Documenting "inspect" and context awareness udf.rst #617

take this UDF context handling use case:

udf = openeo.UDF(
    "...", 
    context={"from_parameter": "context"},
)
cube = cube.apply(udf, context={"factor": 12.34})

This is an important pattern when using parameterized UDFs in UDPs.

The context={"from_parameter": "context"} is crucial to get this working, but not obvious. I think the python client could do this automatically in the appropriate situations