[Plugin] Sync reading history

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Rulia will invoke "addReadHistory" function that provides by plugin to add reading history to target site.

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https://github.com/RuliaReader/plugin.bilibili-manga/issues/4

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Now plugin can define a function named addReadHistory in plugin code:

/**
 *  Add reading history to the target server.
 *
 *  @param {string} url The manga chapter url that the Rulia requests to.
 */
async function addReadHistory (url: string) {
  // Get necessary information from the url.
  // For an example, the url is "https://www.my-manga-site.com/chapter/12450"
  const chapterId = getChapterIdFromUrl(url)  // 12450
  await fetch('https://www.my-manga-site.com/reading-history/add', { ... })
}

Rulia invokes this function when every chapter opens.

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Done

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Available since 0.18.0.