Properly resolve Union of a standard type and csp.ts type within csp.node

[AdamGlustein]

Describe the bug

It seems that Union[X, csp.ts[Y]] is not resolving as a ts-type during parsing.

To Reproduce

import csp
import typing
from datetime import datetime

@csp.node
def n(x: typing.Union[int, csp.ts[int], typing.Any]) -> csp.ts[int]:
    return abs(x)

@csp.graph
def g() -> csp.ts[int]:
    return n(csp.const(1))

res2 = csp.run(g, starttime=datetime(2020,1,1), endtime=datetime(2022,1,1))
print(res2)

Expected behavior

This code should output:

{0: [(datetime(2020,1,1), 1)]}

What I actually get is:

{0: []}

Error Message

Runtime Environment

0.8.0
3.12.9 | packaged by conda-forge | (main, Feb 14 2025, 08:00:06) [GCC 13.3.0]
linux

Additional context

Pertains to #493

[ptomecek]

Nodes will not be able to handle Union types between ts and non-ts types. Instead, we should raise an exception during node signature parsing to that effect.