feat: allow zero slice using func

[lizard-boy]

No description provided.

[greptile-apps]

PR Summary

This PR extends slice assertions in root_assertion_node.go by allowing function call expressions as valid endpoints, updating the low/high index checks in slice expressions.

• Modified /assertion/function/assertiontree/root_assertion_node.go to detect CallExpr endpoints in slice bounds.
• Added flags for low and high indices so that functions like len(x) can be used safely in slice expressions.
• Ensured that the new logic aligns with nilability assertions without evaluating the function call values.
• Verify usage of the custom logging module for error conditions during assertion processing.

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