Update auth api key & export to web/node

[DenisCarriere]

What's new?

• Replace authentication using header X-Api-Key
• Rename header for User-Agent => X-User-Agent
  • add defaultHeadersInterceptor which uses {"X-User-Agent": "@substreams/node"}
• fix createHeadersInterceptor to include headers as interceptor (previously wasn't adding any headers)

What's Breaking?

• Add custom exports to node & web Transports
  • Allows to import @substreams/node directly in browser application without importing NodeJS specific dependencies

import { BlockEmitter } from "@substreams/node";
import { createNodeTransport } from "@substreams/node/createNodeTransport";
// or
import { createWebTransport } from "@substreams/node/createWebTransport";

[changeset-bot]

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Latest commit: f1f4496

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