I want autogold to support raw text snapshots for golden-file assertions.

I want autogold to support raw text snapshots for golden-file assertions.: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). For example, autogold.ExpectFile(t, autogold.Raw("{\"ok\":true}\n")) should expect the golden file to contain {"ok":true}\n directly, with no…