✨ Expose synthetic anomaly detection in the dataloader API

[ashwinvaidya17]

Problem Description

Currently perlin noise generator is used with default parameters when we set validation from synthetic as true.
The goal is to update this API
a) to expose the synthetic anomaly generator (in preparation for adding more methods)
b) expose the parameters of these anomaly generators for finer control (like the blend factor for perlin noise)

Proposed Solution

The solution should begin with an RFC that shows the API and the CLI once the proposal is implemented. Additionally, it should consider backwards compatibility.

Alternatives Considered

No response

Additional Context

No response

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