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Support file descriptor passing in libipm messages with the h format code

Support file descriptor passing in libipm messages with the h format code: a task in LegoFlow-SWE (Harbor dataset). Problem libipm currently cannot send or receive file descriptors as part of a message payload, which prevents inter-process APIs from transferring open handles alongside regular…

The task

**Problem** libipm currently cannot send or receive file descriptors as part of a message payload, which prevents inter-process APIs from transferring open handles alongside regular scalar values. The message formatting layer needs to support a new type code, `h`, representing a file descriptor, similar to…

Part of Lego-X/LegoFlow-SWE.