[ENH] Implement NLinearForecaster model

[rwtarpit]

Reference Issues/PRs

Extends the Linear Series2Series models family started in #3171

What does this implement/fix? Explain your changes.

This PR implements NLinearForecaster which is a variant of Linear Forecaster for series2series forecasting.
NLinear adds normalization for any distribution shift in data and is built on top of LinearForecaster.

Does your contribution introduce a new dependency? If yes, which one?

No

Any other comments?

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I have added the following labels to this PR based on the title: [ enhancement ].
I have added the following labels to this PR based on the changes made: [ forecasting ]. Feel free to change these if they do not properly represent the PR.

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