add support for tuples in attributes

[mindler-sasu]

Allows only to select elements of the tuple type

[mindler-sasu]

The typing is actually nto correct yet. Trying to solve it.

type a = ObjectFullPaths<{ tuple: [{ bar: "beer" }, { beer: "karhu" }] }>;
// "tuple" | "tuple[0]" | "tuple[1]" | "tuple[0].beer" | "tuple[0].bar" | "tuple[1].beer" | "tuple[1].bar"

should be

// "tuple" | "tuple[0]" | "tuple[1]" | "tuple[0].bar" | "tuple[1].beer"

[mindler-sasu]

Now works correctly