Add repository browser to fetch and select repositories from a user

[Philipp0205]

Summary

Implement a repository browser view that allows users to fetch all repositories for a GitHub/Bitbucket user or organization and select a repository to work with.

User Story

As a developer, I want to browse and select from all my accessible repositories, so that I can easily switch between different projects without manually entering repository URLs.

Proposed Solution

• Create new "Repository Browser" view or wizard
• Fetch repositories using GitHub/Bitbucket user/org APIs
• Display repositories in searchable/filterable tree or list
• Show repository metadata (name, description, last updated, visibility)
• Double-click or "Open" action to configure plugin for selected repository
• Cache repository list with refresh capability
• Support both personal and organization repositories

Acceptance Criteria

• New view or wizard for browsing repositories
• Fetches all accessible repositories for authenticated user
• Displays repository name, description, and metadata
• Search/filter functionality for large repository lists
• Select repository to configure pull request plugin
• Works for GitHub repositories
• Works for Bitbucket repositories
• Handles pagination for users with many repositories
• Repository list can be refreshed
• Shows loading state during fetch

Technical Considerations

• GitHub: Use /user/repos and /orgs/{org}/repos endpoints
• Bitbucket: Use /repositories/{workspace} endpoints
• Implement pagination handling (GitHub returns 30 per page)
• Use Eclipse Jobs API for async repository fetching
• Create SWT TreeViewer or TableViewer for repository display
• Add text filter using ViewerFilter
• Cache repository metadata in preference store
• Consider lazy loading for organization repositories
• Handle authentication and scopes/permissions
• Sort repositories by last updated or name