Split ChildJob out from Job class

Angelos Evripiotisrequested to merge
aevri/split_jobs_parent_child into master

Make it clearer what happens in which process by splitting out a 'ChildJob', which encapsulates the work that happens in the child process.

This also makes it possible to control what is transferred to the child process. This is very useful for adding support for the 'spawn' method of creating child processes as opposed to the 'fork' method. It may also help us lower the overall memory usage of BuildStream.

Edited by Angelos Evripiotis

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