feat: add User language functions to API spec

[sherwinski]

Description

1 Line Summary

Adds the User Language functions from #1171 to the project's API spec file

Details

Systems Affected

• WebSDK
• Backend
• Dashboard

Validation

Tests

Info

Checklist: N/A

• All the automated tests pass or I explained why that is not possible
• I have personally tested this on my machine or explained why that is not possible
• I have included test coverage for these changes or explained why they are not needed

Programming Checklist: N/A
Interfaces:

• Don't use default export
• New interfaces are in model files

Functions: N/A

• Don't use default export
• All function signatures have return types
• Helpers should not access any data but rather be given the data to operate on.

Typescript: N/A

• No Typescript warnings
• Avoid silencing null/undefined warnings with the exclamation point

Other: N/A

• Iteration: refrain from using elem of array syntax. Prefer forEach or use map
• Avoid using global OneSignal accessor for context if possible. Instead, we can pass it to function/constructor so that we don't call OneSignal.context

Screenshots

Info

Checklist

• I have included screenshots/recordings of the intended results or explained why they are not needed

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Related Tickets

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This change is