[Univeral sentence encoder] Ports tfjs Univeral sentence encoder model

[joeyklee]

Dear ml5 community,

I'm making a Pull Request(PR). Please see the details below.

A good PR 🌟

→ Step 1: Which branch are you submitting to? 🌲

Development (for new features or updates), Release (for bug fixes), or ___________?

• development

→ Step 2: Describe your Pull Request 📝

Fixing a Bug? Adding an Update? Submitting a New Feature? Does it introduce a breaking change?

• adds the Universal Sentence encoder: https://github.com/tensorflow/tfjs-models/tree/master/universal-sentence-encoder
• Related to: Universal Sentence Encoder #197

A great PR 🌟🌟

→ Step 3: Share a Relevant Example 🦄

Here's some example code or a link to another PR in https://github.com/ml5js/ml5-examples OR in the https://editor.p5js.org or codepen/jsfiddle/etc...

• Accompanying example can be seen here: [Universal sentence encoder] Adds example for Universal Sentence Encoder ml5-examples#262

[joeyklee]

Hi @bomanimc!

For simplicity, let's do it this way:

1. Re: [Universal sentence encoder] Adds example for Universal Sentence Encoder ml5-examples#262 (comment) - Let's merge the PR for this feature and the PR for the example now.
2. We can refine and update once the m5-examples and library merge is complete.
3. We can leave it undocumented until we feel it is ready for more public usage and once we have some more examples showcasing how it works, but for simplicity of devOps, I think it is ok to merge.

[joeyklee]

Hi All - I think this is ready to go. @bomanimc I will merge this in for now. We can refine the examples to make them a bit friendlier as we see fit. Thanks @henrmota for your reviews earlier on -- they were very helpful! 🙏