Diffbot webcrawler unit testing

[JortegaCognigy]

This PR adds unit tests for the diffbot webcrawler knowledge connector. It also adds types based off documentation from the diffbot website.

Changes

• Generated unit tests for diffbot webcrawler without making any functional changes
• Types generated from 200 response samples found in diffbot documentation:
  • https://docs.diffbot.com/reference/create-a-crawl
  • https://docs.diffbot.com/reference/manage-a-crawl-job
  • https://docs.diffbot.com/reference/retrieve-crawl-job-data

[graymalkin77]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.