feat(toolbox): add ipld/go-fixtureplate

[SgtPooki]

Tools to generate and inspect IPLD data to assist in testing.

related links:

• https://drive.google.com/file/d/1k7Z1CPp_9LgGXwwsL3Dgmh_DXkWCuYcW/view
• https://filecoinproject.slack.com/archives/C02PEJRHMC4/p1695795500987719