[Feature]: Function definitions as tools should have their parameters object type be type checked (in typespec)

[creatorrr]

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🔖 Feature description

Function definitions are supposed to be like this:

function:
  name: sum
  description: ...
  parameters:
    type: object
    properties:
      a:
         type: number
         default: 0
      b: 
  ... . . ....

But currently we do not do any validation for them in typespec (code). We should use typespec's jsonschema libs to validate them.

🎤 Why is this feature needed ?

No response

✌️ How do you aim to achieve this?

No response

🔄️ Additional Information

No response

👀 Have you spent some time to check if this feature request has been raised before?

• [X] I checked and didn't find similar issue

Are you willing to submit PR?

None