Add support for persistent ID and filtering on ID in exploration space

[gabegma]

Supports #297 and fixes #200

Description:

You can look at the commits' message for the details of what I have done.

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[JosephMarinier]

You mentioned by was not a great variable name... I agree. It's just a detail, but here is a simple change:

[JosephMarinier]

You mentioned by was not a great variable name... I agree! It's just a detail, but here is a simple change:

[JosephMarinier]

That's pretty cool! Thank you!
It should then be very easy to add it to the response of /utterances... In another PR?

[gabegma]

It should then be very easy to add it to the response of /utterances... In another PR?

Right @JosephMarinier, maybe it can be included in the PR where you show it on hover in the UI? That way you can name the variable in the API how you prefer. I can also include it in this PR, let me know.

[JosephMarinier]

Perfect plan! 👌