trunk/bbfa9a9a623ac3cf9809efef1fcea7e83773bf77: [AOTI][refactor] Move the model pool into its own header (#201508)

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Summary (human written only) Move ModelPool into its own file. Better structure, easier to write unit test. Agent details This PR was authored with an AI assistant (Claude Code). Everything in this section is AI-generated. This moves ModelPool from model_container.h into aoti_runtime/model_pool.h without changing it, so that it can be read on its own and tested against a fake model; the pool's unit test is the last…

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