Prepare web-api and node SDKs

[edolix]

Description

This PR includes the required changes to start releasing the web-api and node SDKs.

It also includes the implementation of the validateRequest in the WebAPI namespace.

---

Before release

• Remove private from node and web-api package.json files

Type of change

• New packages
• Internal refactoring
• Bug fix (bugfix - non-breaking)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Code snippets

import { WebAPI } from "@signalwire/node"

const validKey = "PSK_foo" // for the API page in the dashboard
const header = request.headers["X-SignalWire-Signature"]
const url = "https://myapp.example.com/webhook" // url configured to handle this request
const rawBody = JSON.stringify(request.body) // JSON request body as string

const valid = WebAPI.validateRequest(validKey, header, url, rawBody);

if (valid) {
  // request is coming from SignalWire
}

[changeset-bot]

🦋 Changeset detected

Latest commit: 93b4959

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@signalwire/web-api	Major
@signalwire/node	Major

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