viable/strict/1788112218: [MPS] Add special_laguerre_polynomial_l (#195225)

发生了什么

I have built and run the tests for this change locally on Apple silicon before submitting. The description below was drafted with an AI assistant, so it is quoted rather than presented as my own prose. Adds a native Metal kernel for special.laguerre_polynomial_l , which so far only had CPU, CUDA and XPU implementations and was listed as unimplemented in the MPS xfail list. The op is the shape already used by the ten…

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