Raise temperature when doing multiple rollouts (and warn otherwise)

[okhat]

Summary

• Warn once per dspy.LM instance when rollout_id is used with temperature=0, and reset the warning on LM.copy.
• Default init_temperature to 1.0 in MIPROv2 and propagate it through GroundedProposer and related proposers.
• Hardcode rollout copies to temperature=1.0 and sequential IDs in BestOfN, Refine, BootstrapFewShot, InferRules, and SIMBA resampling, clarifying when cache bypass occurs.

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https://chatgpt.com/codex/tasks/task_e_68b486c77b78832984300abc4a28e89f