Error constructor should not accept additional fields (rest) for the detail if there are fields with individual field descriptors

[MaryamZi]

Description:
$title.

See ballerina-platform/ballerina-spec#740, ballerina-platform/ballerina-spec#393

Steps to reproduce:

type Error error<record { int code; }>;

Error e = error Error("One", code = 1000); // OK

Error e2 = error Error("Two", code = 2000, additional = "additional field"); // Should be an error

Affected Versions:
slalpha1