Review the JSONSchema in VC

[Kailai-Wang]

Context

At present the JSON schema in VC is pretty much a placeholder, it's neither used nor contains the real schema information. The schema registry is empty too.

There's some code prepared in the VCMP pallet. Meanwhile, we have some TODOs in the vc generation, e.g.:

litentry-parachain/tee-worker/litentry/core/credentials/src/lib.rs

Lines 336 to 339 in 6313204

	pub fn validate_schema(&self) -> Result<(), Error> {
	//ToDo: fetch schema from Parentchain and check its status
	Ok(())
	}

Tasks:

• do the search, maybe refer to w3c standard
• review the usage of JSONSchema
• decide on the right workflow including the store, retrieval, version management, content generation ...

We can implement it along with the review if not too sophisticated, otherwise let's have dedicated issues for the implementation.

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[Kailai-Wang]

I have been reviewing and double-checking this recently, maybe I can provide some feedbacks/comments too

[github-actions]

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