get embedding for text

[jlabrada71]

Description of change

Fixes #123

Implements a method that returns the embedding of a text. It is an adapted copy of the embedding.cpp from llama.cpp/examples

Pull-Request Checklist

• [ x] Code is up-to-date with the master branch
• [ x] npm run format to apply eslint formatting
• [ x] npm run test passes with this change
• [ x] This pull request links relevant issues as Fixes #0000
• [ N/A] There are new or updated unit tests validating the change
• [ N/A ] Documentation has been updated to reflect this change
• [ x] The new commits and pull request title follow conventions explained in pull request guidelines (PRs that do not follow this convention will not be merged)

[giladgd]

@jlabrada71 I'm already working on support for embedding that will be available soon in the version 3 beta. The implementation example in the llama.cpp repo requires some more adaptations to provide a stable support for this without side effects, and version 3 is a major refactor that changes the structure of the project, so I prefer to wait for my own implementation for this one.

I predict it'll be available in the version 3 beta in about ~3 weeks.

Anyway, thank you for your contribution :)