Develop Bitbucket parser

[Pierre-VF]

For now, Bitbucket repos are identified, but parsing has not been implemented.

That could be a good occasion to develop a standard parser class (which can be extended for each source)

[github-actions]

🤖 This is an automated response from Repo Assist.

This is a great candidate for a first contribution! Looking at the existing code, there's already a solid foundation to build on:

• src/oss4climate/src/parsers/git_platforms/bitbucket_io.py has the BitbucketScraper class with URL identification and target classification already working. All data-fetching methods (fetch_project_details, fetch_repository_readme, etc.) currently raise NotImplementedError.
• The GitHub and GitLab scrapers (github_io.py, gitlab_io.py) serve as working reference implementations.
• The Bitbucket REST API docs are at (developer.atlassian.com/redacted) — the key endpoints needed are /2.0/repositories/{workspace}/{repo_slug} for repo details and /2.0/repositories/{workspace}/{repo_slug}/src/{commit}/README.md for readmes.

Suggested starting point: implement fetch_project_details first (it's the highest-value method), then fetch_repository_readme. The fetch_repositories_in_organisation method would also be valuable.

Note: Bitbucket has lower rate limits for unauthenticated API calls, so the implementation should handle 429 responses gracefully like the other parsers do.

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