Add test to validate runtime/compiletime interfaces about lodestar HOT 4 CLOSED

why are there 3 of us assigned to this?

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I can take this if yall want.

Typescript doesn't exist at runtime, so unless we want to separately write a test for each type by hand (we don't), you can't just do something like:

// file 1
export interface a {}
export interface b {}
export interface c {}

// file 2
import interfaces from "./file1"

for (let i in interfaces) { // error here, interfaces don't actually exist!
  ...
}

Unfortunately, a real solution is a little hairy (we need to manually parse our types files to suss out the interface definitions) but I'm prototyping something now.

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@ansermino No idea how/why i did that.

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I was playing around with this @wemeetagain https://stackoverflow.com/questions/14425568/interface-type-check-with-typescript

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