SNGP layers ported form edward2 to notebook

[nsanghi]

Description

This PR updates the SNGP demo notebook to self contain implementations of SNGP specific layers for Spectral Normalization and Random Features GP. The implementation is a simplified port of the code in edward2 library

Issue

This PR solves #1102

Checklist

• [x] Performed a self-review of the code
• [x] Tested on Google Colab.

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