[Proposal] Allow read file from URL

[himself65]

Proposal API:

import { CompleteFileSystem } from '../storage'

/**
 * A reader takes imports data into Document objects.
 */
export interface BaseReader {
  loadData(
    url: URL,
  ): Promise<Document[]>;
  loadData(
    filePath: string,
    fs?: CompleteFileSystem,
  ): Promise<Document[]>;
}

Example:

const reader = new PapaCSVReader();
const url = new URL("https://raw.githubusercontent.com/run-llama/LlamaIndexTS/main/examples/data/movie_reviews.csv");
const documents = await reader.loadData(url);
// ...

[himself65]

#754