Add test for infinite time parents

Walkthrough

This update introduces a new test to scrutinize the behavior of graphs with nodes set at infinite times, specifically focusing on parent-child edge additions and the validation of node times. This change is pivotal in addressing the considerations around allowing nodes at infinity within Graphical Isolation with Migration (GIG) models, thus ensuring compatibility with existing paradigms and enhancing the model's robustness in handling edge cases.

Changes

File	Change Summary
`tests/test_tables.py`	Added `test_parent_child_at_inf` to check infinite node times and validate parent-child edge addition.

Assessment against linked issues

Objective	Addressed	Explanation
Should GIGs be allowed to have a node at time=infinity? (#95)	❓	The change introduces a test for handling infinite times but does not explicitly decide on allowing or disallowing nodes at infinity in GIGs.

Poem

In the realm of code, where logic reigns,
A rabbit hopped, through data plains.
🐇💻 It found a node, at infinity's door,
"To allow, or not?" it pondered more.
With tests it leaped, through time and space,
Ensuring each edge, found its rightful place.
🌌🔍 In graphs so vast, with nodes spread wide,
It seeks the paths, where truths abide.

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hyanwong / giglib