feat!: use Fetch API for HTTP transport

[kahirokunn]

Fixes: cloudevents#534

Proposed Changes

Use the Fetch API for the built-in HTTP transport.

Description

This removes the Node-only HTTP imports that cause browser bundling failures. httpTransport() returns the native Fetch Response and the handled body. Non-2xx responses, aborts and network failures reject with HTTPTransportError. The transport also accepts Fetch options, response handlers and abort signals.

See API_TRANSITION_GUIDE.md for the breaking changes and migration examples.

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