Add a new function assertStringify()

[samchon]

export function assertStringify<T>(input: T): string;
export function createAssertStringify<T>(): (input: T) => string;

assertStringify() is a new function combined assertType() and stringify().

When it converts an input value to JSON string, its type would be automatically validated and if the input value is not following the type T, TypeGuardError exception would be thrown. I think this function would be much useful than TSON.stringify() and it would be faster than JSON.stringify() even containing the validation process.

[samchon]

Conversion speed of TSON.assertStringify() measured in Intel i5-1135g7 Surface Pro 8.

Not optimizied yet, but soon. Therefore, conversion speed would be boosted up more.