Create new test fixtures for forward compatibility testing

[jsync-swirlds]

Story Form

As a Block Node Engineer
I want to have test fixtures for forward compatibility testing
So that I can efficiently create unit tests for each plugin

Technical Notes

• Create a modified block stream definition with a new BlockItem - "IllusoryBlockItem".
• Create blocks dynamically with every BlockItem type, in several configurations, some of which include the "IllusoryBlockItem" (alone, and in combination with other items).
  • Call these "blanket blocks" for ease of discussion