[WIP] Add Github Integration

[Copilot]

• Create project structure for Elsa.Integrations.GitHub
• Add project references and package dependencies (Octokit.NET)
• Implement base GitHubActivity class
• Implement GitHubClientFactory service
• Implement GitHubFeature for DI registration
• Implement GitHub activities by category:
  • Issue activities (CreateIssue, GetIssue, UpdateIssue, DeleteIssue, SearchIssues)
  • Comment activities (CreateComment, GetComment, UpdateComment, DeleteComment)
  • Label activities (AddLabels, DeleteLabel)
  • Pull request activities (GetPullRequest, SearchPullRequests)
  • Repository activities (GetRepository, GetBranch, SearchBranches)
  • User activities (GetUser, AddAssignees, DeleteAssignees, GetAssignee, SearchAssignees)
  • Organization activities (GetOrganization, SearchOrganizationMembers)
  • Milestone activities (GetMilestone, SearchMilestones)
  • Release activities (GetRelease, SearchReleases)
  • Gist activities (GetGist, SearchGists)
  • Trigger/watch activities (WatchIssues, WatchPullRequests, WatchBranches)
  • GraphQL activity (ExecuteGraphQLQuery)
• Create README.md with documentation
• Update main README.md to reflect the GitHub integration
• Add unit tests

Fixes #6.

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[sfmskywalker]

@copilot great job so far! Due to a technical issue ( you were rate limited), your work is not yet complete. Please check your current commit log etc. and resume where you got cutoff.

[Copilot]

@copilot great job so far! Due to a technical issue ( you were rate limited), your work is not yet complete. Please check your current commit log etc. and resume where you got cutoff.

I've resumed the work and completed the implementation of the GitHub integration. I've added the missing activities for milestones, releases, and gists. The Releases directory was initially being ignored due to the .gitignore pattern, but I've force-added it in commit e49fd90. All requested activities are now implemented, and only the unit tests task remains.