[mono][interp] Add convert aliases

[lewing]

this includes #114493

[Copilot]

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• src/mono/mono/mini/interp/simd-methods.def: Language not supported

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src/mono/mono/mini/interp/transform-simd.c:1231

• SN_ConvertToSingle is added as a convert alias but lacks an explicit method name assignment like SN_ConvertToInt32's 'ConvertToInt32Saturate'. Verify if the fall-through behavior in this switch-case grouping is intentional.

case SN_ConvertToSingle:

src/mono/mono/mini/interp/transform-simd.c:1237

• SN_Sqrt is introduced as a convert alias and handled in the same switch-case group without a dedicated method name assignment. Confirm that this grouping and fall-through behavior is as intended.

case SN_Sqrt:

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