Align Ballerina runtime generated errors to new error format.

[rdhananjaya]

Description:
For examle the type cast error at the moment is
{ballerina}TypeCastError {"message":"incompatible types: 'OurProccessingError' cannot be cast to 'errors:OrderProcessingError'"}

This is in the old error format, with a string and a message. We should align this to the new format.

error "incompatible types: 'OurProccessingError' cannot be cast to 'errors:OrderProcessingError'"

or

TypeCastError "incompatible types: 'OurProccessingError' cannot be cast to 'errors:OrderProcessingError'"

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