Cutout-Assisted Debugging

[phschaad]

This PR contains varios improvements to how cutouts are handle, together with a number of extensions to the capabilities around data instrumentation. The common goal is to enable a workflow where transformations or codegen issues can be localized and more easily diagnosed / debugged through the help of minimal test cases. The concrete list of changes consists of:

• Making cutouts an SDFG subclass to allow them to carry additional data such as their input/output configurations and what SDFG they came from.
• Removing hashes from the serialization test. They are not useful for testing the serialization framework and cause failures even just if the set of hashed properties does not match exactly with the set of serialized properties. This may be the case, for example, if an SDFG subclass (such as cutouts) is serialized to an SDFG.
• Allowing cutouts to be constructed from transformations (i.e., their set of affected nodes) based on pattern matching or subgraphs.
• Allowing symbols to be dumped and restored through data instrumentation on SDFG states.
• Making InstrumentedDataReports able to read dumped symbol values.
• Capturing the cutout's inputs/outputs through a dry run of the full SDFG, including symbol values.

[tbennun]

Looks good overall. Some questions and minor changes.

[tbennun]

Looks great, thank you!