Add few missing kwargs to the handler invocation (used in docs)

[nolar]

Issue : #79

Add the missing kwargs to the handler functions for the commonly used metadata fields. Specifically, namespace was mentioned in the docs, but absent in the code.

[zincr]

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[zincr]

🤖 zincr found 1 problem , 0 warnings

❌ Approvals
✅ Large Commits
✅ Specification
✅ Dependency Licensing

Details on how to resolve are provided below

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• ✅ Approved by PR author @nolar
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