Add run_process

[m-mohr]

Proposal for solving Open-EO/openeo-api#413 in a non-breaking way.

Similar functions in other programming languages:

• PHP: https://www.php.net/manual/de/function.call-user-func-array.php
• Many other languages simply allow using a variable as a function name, e.g. in JS: let func = 'max'; Math[func](123, 321)
• Some languages use a "reflection" API for similar purposes, e.g. https://docs.oracle.com/javase/tutorial/reflect/index.html

[jdries]

See comment on other issue: currently not in favor of this as a solution to avoid allowing parameters for process_id.

[dthiex]

Changes look okay to us.

[soxofaan]

a devil's advocate argument against this process: I think you lose the ability to statically check/validate your process graph because the output schema of run_process is only known at run time.

This might be annoying in several places: visualization of process graph (e.g. in web editor), in clients that use output schemas to help building a process graph , the /validation end point, the dry-run procedure in the geopyspark driver, ...

[m-mohr]

This might be annoying in several places: visualization of process graph (e.g. in web editor), in clients that use output schemas to help building a process graph , the /validation end point, the dry-run procedure in the geopyspark driver, ...

Yes, but checking it in the JS tooling shows that this is equally annoying as allowing variable for process_id. It is basically the same implementation-wise, just a different encoding.