Configurable pagination delay

[sujito00]

Problem

Pagination methods have hardcoded sleep durations:

• searchAll(): 1000ms between pages
• getUserTweetsAll(): 1000ms between pages
• getBookmarksAll(): 500ms between pages

These values are baked into the code. Users who want faster scraping (at the risk of rate limits) or slower scraping (for safety) have no way to adjust.

Proposed solution

Add a pageDelay option to the client constructor and per-method overrides:

const client = new XReaderClient({
  cookies: { ... },
  pageDelay: 1500, // default between pages
});

// Or per-command via CLI
x-reader search "query" --all --delay 2000
x-reader bookmarks --all --delay 500

Additional context

This pairs well with #1 (retry with backoff). Together they give users full control over request pacing.