TypeScript types: suggest omitting Float32Array type

[ddadamhooper]

1. With noUncheckedIndexAccess enabled, TypeScript gives the wrong types when destructuring:

function doSomething([x, y]: ReadonlyVec2) {
    console.log(x + y); // error: typeof x = number | undefined
}

2. TypeScript doesn't throw errors when it "should":

function doSomething([x, y, z]: ReadonlyVec2) {
                         // ^^ should be type error!
}

Related: #381.

At Datadog, we've built our "solution": we used yarn patch to simply erase Float32Array as a type. TypeScript now treats gl-matrix objects as tuples.

The downside: without accepting Float32Array, it's hard to cast Float32Array to vec2. That's no problem if callers only use vec2.create() and vec2.fromValues(). But it's a problem if callers are allocating a Float32Array themselves and doing vector math on slices of it.