Refactor `cpu_profile_model` to prevent side effects

The functions called in `generateFromCpuSamples` must be called in that particular order. This is because of function side effects:

1. Generating the stack frames both creates the timeline tree and assigns frame IDs to every node in the tree
2. Creating the sample events expects that the tree has already been created, and that the frame IDs have been assigned to every node

Ideally we should refactor the code so that we aren't dependent on hidden side effects.

从 cpu_profile_model 中的 generateFromCpuSamples 开始，按要求的顺序跟踪它调用的函数。重构流程，使树的创建和 frame-ID 分配变得明确，而不是隐藏的副作用，同时保留 sample-event 生成和现有的 profiling 行为。

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