[Feature] Add init value option to AddStateIndependentNormalScale

[elin-bdai]

Description

When using AddStateIndependentNormalScale (in our case specifically with scale_mapping relu) we'd like the option of initializing the scale to any value based on our configurations. I added the option of taking in an initial value. Since it's set to 0.0 for default, it should be the same as initializing to torch.zeros.

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You can use the syntax close #15213 if this solves the issue #15213

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[vmoens]

The PR looks good, can you just sign the CLA? Thanks a mil for this!