feat: add article parsing and handling to timeline and scraper modules

[LiamVDB1]

This pull request introduces support for handling articles within the timeline data structure. It includes changes to add new interfaces for articles, parse article data into markdown, and integrate articles into existing tweet parsing functionality.

Article Support Enhancements:

• New Interfaces for Articles:

  • Added ArticleRaw, ArticleResultRaw, ArticleContentStateRaw, and related interfaces to represent article data, including metadata, media, and content state. (src/timeline-v1.ts, src/timeline-v1.tsR122-R194)
  • Updated SearchResultRaw and TimelineResultRaw to include an optional article field for article data. (src/timeline-v1.ts, [1] [2]

• Article Parsing Logic:

  • Implemented parseArticleToMarkdown to convert article content into markdown format, handling text, links, styles, headers, lists, and media. (src/timeline-v2.ts, src/timeline-v2.tsR261-R393)
  • Added parseArticle function to map raw article data to the new Article interface, including extracting cover media details. (src/timeline-v2.ts, src/timeline-v2.tsR261-R393)

• Integration with Timeline Parsing:

  • Updated parseResult to detect and process articles within timeline results, converting them to markdown and integrating them into the Tweet structure. (src/timeline-v2.ts, src/timeline-v2.tsR419-R425)

Tweet Interface Updates:

• Support for Articles in Tweets:
  • Extended the Tweet interface to include isArticle and article fields, enabling tweets to reference associated article data. (src/tweets.ts, src/tweets.tsR79-R80)
  • Added a new Article interface to define the structure of article data within tweets. (src/tweets.ts, src/tweets.tsR40-R46)

[karashiiro]

Sorry it took so long for me to get around to this - could you add one or two basic tests to tweets.test.ts to validate that article parsing works at a basic level? It should be enough to just find a couple tweets with articles and check that the output is what we should expect it to be.