PI Migration: get forms into serialization about spiff-arena HOT 3 CLOSED

We started this branch https://github.com/sartography/spiff-arena/tree/add-form-hash-to-serialize-spec but we are aborting on this for now.

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we were thinking about adding a table, form_schema, to link up git revisions, form hashes, form filenames, and process model identifiers with their corresponding form contents. we know we need to get something into the serialization in order for the user task form definition to work seamlessly for process instance migration, so we also started writing a Custom converter for user tasks with some guidance from Elizabeth. we got hung up because actually getting the form schema hash turns out to be not at all straightforward. from inside the converter, we could figure out what process model the task spec is in, potentially, and do the filesystem and json operations to determine the hash, but this seems slow and potentially outside the scope of what a to_dict function is generally supposed to do. since this is not something that obviously affects myome, we'll set it aside for now.

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merged this content into #1922 , so closing this as dup.

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