Expose ts types

[suneab]

Would it be possible to expose payload types for sparkplug-payload?
I can make the changes, just wondering if theres a reason why it isn't exposed already.

Currently, the way i work around this is by grabbing the return type of decodePayload, which is a bit silly but works

import { get } from "sparkplug-payload"
const { decodePayload, encodePayload } = get("spBv1.0")!
export type Payload = NonNullable<ReturnType<typeof decodePayload>>
export type Metric = NonNullable<Payload["metrics"]>[0]
export type MetricValue = Metric["value"]
export type DataType = Metric["type"]