Changes to POST /EXPERIMENTAL_validators_ordered

added subschema #1 to the response body oneOf list for the response status 200

removed JsonRpcResponse_for_Array_of_ValidatorStakeView_and_RpcValidatorError_variant0 from the response body oneOf list for the response status 200

request property jsonrpc was restricted to a list of enum values

the request property id became optional

the request property jsonrpc became optional

the id request property default value dontcare was added

the jsonrpc request property default value 2.0 was added

added the new 2.0 enum value to the request property jsonrpc