[run] Support returning nested data types (e.g. list of lists)

[khalatepradnya]

Required prerequisites

• Search the issue tracker to check if your feature has already been mentioned or rejected in other issues.

Describe the feature

CUDA-Q run does not support kernels that return nested or aggregate vectors / lists / structs (e.g., list[list[int]]).
(main as of commit ID 5cf20bd)

This should be supported.

• Example 1

import cudaq

@cudaq.kernel
def test() -> list[list[int]]:
    return [[1, 2], [3, 4]]

cudaq.run(test)

fails with RuntimeError: cudaq.run does not yet support returning nested list from entry-point kernels.

• Example 2

import cudaq
from dataclasses import dataclass

@dataclass(slots=True)
class MyTuple:
    foo: int
    bar: list[bool]

@cudaq.kernel
def test_tuple() -> MyTuple:
    return MyTuple(42, [True, False, True])

cudaq.run(test_tuple)

fails with RuntimeError: Unsupported element type in struct type.

[khalatepradnya]

@mawolf2023 for viz.