Add missing fields to streams

Following fields are missing from the streams:

• Pull Requests
  [ '_links', 'assignee', 'assignees', 'author_association', 'base', 'comments_url', 'commits_url', 'diff_url', 'head', 'html_url', 'issue_url', 'labels', 'locked', 'merge_commit_sha', 'milestone', 'patch_url', 'requested_reviewers', 'requested_teams', 'review_comment_url', 'review_comments_url', 'statuses_url', ]
• Reviews
  ['_links', 'author_association', 'submitted_at', 'user.avatar_url', 'user.events_url', 'user.followers_url', 'user.following_url', 'user.gists_url',
  'user.gravatar_id', 'user.html_url', 'user.organizations_url', 'user.received_events_url', 'user.repos_url', 'user.site_admin', 'user.starred_url', 'user.subscriptions_url', 'user.type', 'user.url']
• Stargazers
  ['user.avatar_url', 'user.events_url', 'user.followers_url', 'user.following_url', 'user.gists_url', 'user.gravatar_id', 'user.html_url', 'user.login', 'user.organizations_url', 'user.received_events_url', 'user.repos_url', 'user.site_admin', 'user.starred_url', 'user.subscriptions_url', 'user.type', 'user.url']
• Collaborators
  ['avatar_url', 'events_url', 'followers_url', 'following_url', 'gists_url', 'gravatar_id', 'html_url', 'organizations_url', 'permissions', 'received_events_url', 'repos_url', 'site_admin', 'starred_url', 'subscriptions_url']
• Assignees
  ['avatar_url', 'events_url', 'followers_url', 'following_url', 'gists_url', 'gravatar_id', 'html_url', 'organizations_url', 'received_events_url', 'repos_url', 'site_admin', 'starred_url', 'subscriptions_url']
• Commits
  ['author', 'commit.verification', 'committer']
• Issues
  ['assignee', 'assignees', 'author_association', 'body', 'closed_at', 'comments', 'comments_url', 'created_at', 'events_url', 'html_url', 'labels', 'labels_url', 'locked', 'milestone', 'number', 'repository_url', 'state', 'title', 'url', 'user']

The issue does not name any files, tests, or entry points. Start by locating the stream definitions for Pull Requests, Reviews, Stargazers, Collaborators, Assignees, Commits, and Issues, then compare their output with the listed fields. Done means each stream exposes the requested fields and relevant tests confirm them.