feat: add advanced search options (--from, --to, --lang, --since, --until, --has, --exclude, --min-likes, --min-retweets)

Closes #17

- New search.py query builder module
- QUERY argument now optional when using advanced filters
- 21 unit tests + 3 CLI integration tests for search
- Bumped version to 0.7.0

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "twitter-cli"
-version = "0.6.6"
+version = "0.7.0"
 description = "A CLI for Twitter/X — feed, bookmarks, and user timeline in terminal"
 readme = "README.md"
 license = "Apache-2.0"