Pre load scripts so they are cached

[charleyf]

🛠 Summary of changes

This PR loads four additional scripts from Acuant when the document-capture page loads. This makes it so that when the user clicks on the selfie capture, that screen opens much faster b/c the scripts are cached.

📜 Testing Plan

• Run this branch locally, open the network tab for debugging,.
• Make sure you turn off the "Disable cache" option in the network tab. We want caching enabled.
• Load the document capture page. Note that the four new scripts load when you load the page. Also note how long it takes each one to load (something less than ~200ms each is expected).
• Now click the selfie box, note that the four scripts are loaded again, but they are MUCH faster, something like ~30ms.

[dawei-nava]

Well the number I got is around 200+ms for the json on mobile device. Functionally it still works.

ok, that may include wait time. So the download time seems similar. Guess that's what you are describing.

[dawei-nava]

LGTM! 👍

[aduth]

Are these only loaded when applicable for selfie, i.e. not when document capture only? I wasn't able to find where these script sources are assigned.

[charleyf]

@aduth This is where the condition for the script loading is. Two points:

• These scripts are loaded only when the selfie is required.
• These scripts aren't actually -used- anywhere in our code. The point here is to cache them when we load the other Acuant scripts so when a user opens the selfie capture, there's a much smaller delay.

[aduth]

Gotcha 👍 The main thing for me was only doing the background load when selfie was enabled, which looks like this code is handing. Not sure why I wasn't seeing this code when I searched "weights" earlier! Probably user error 😄