Sample new embedding from maximum likelihood estimate

[jeremyasapp]

This PR improves over the status quo of producing random embeddings for unknown tokens by learning a normal distribution over the provided embeddings.

[sonarqubecloud[bot]]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

67.9% Coverage
0.0% Duplication

[jeremyasapp]

The sonar error is due to the fact that i had to fix some flake8 errors across the code base. Should be ignored