fix: build hydrogen using parcel

[aminya]

TODO: remote kernel doesn't work

[todo]

use @aminya/xmlhttprequest

hydrogen/lib/ws-kernel-picker.ts

Lines 201 to 205 in e1bbb7e

	const { XMLHttpRequest } = require("xmlhttprequest"); // TODO use @aminya/xmlhttprequest
	const request = new XMLHttpRequest();
	// Disable protections against setting the Cookie header
	request.setDisableHeaderCheck(true);
	return request as XMLHttpRequest; // TODO fix the types

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This comment was generated by todo based on a TODO comment in e1bbb7e in #2116. cc @nteract.