specs(thread safe queue): trivial specs for existence

[liamjdavis]

This pull request adds new specs to ensure correct behavior of the QueueConfig struct in the thread-safe queue module. The main focus is on verifying the Clone implementation and direct construction of the config.

Tests and verification improvements:

• Added clone_queue_config spec to verify that cloning a QueueConfig preserves the max_queue_size field, along with a proof function check_clone_config to assert this behavior.
• Added check_construct_config spec to verify that a QueueConfig can be constructed directly with a specified max_queue_size, and that the value is correctly set.