[Feature]: Add region of interest to sig_noise

[wincowgerDEV]

Guidelines

• I agree to follow this project's Contributing Guidelines.

Description

I think it could be useful to allow a user to specify where the signal is and where the noise is in the sig_noise function.

Problem

Users currently have to use a second function to fine-tune signal and noise calculations and may have to deal with some complex logic to nest them together correctly.

Proposed Solution

Add specification for signla region and one for noise region in sig_noise. This could be passed first to using restrict_range to create a dataset for just the signal and one for just the noise. If null then use the whole dataset.

Alternatives Considered

Require the logic explained in the problem.

[wincowgerDEV]

Fixing with #157