Add User Contribution Summary API

[samad-yar-khan]

Issue(s)

• Resolves [New] Add BFF API to fetch User GH Summary #26
• As per current requirement this API also caters to the original use cases for
  • [New] Add Method to fetch users PR count in interval #22
  • [New] Add Method to fetch users Contribution Count in interval #23
  • [New] Add Method to fetch users Issue Count in interval #24
    This is because the original plan was to make parallel Calls to these but this can be done in a single query, which is faster and solved the current usecase.

Acceptance Criteria fulfillment

• PR Counts (Along with Repo Count)
• Issue Count (Along with Repo Count)
• Commits Count (Along with Repo Count)
• Review Count (Along with Repo Count)

Proposed changes (including videos or screenshots)

• Added single method fetchUserContributionSummaryMetrics that fetches all data needed for summary in a single query. this saves us multiple API calls.
• Defined Types:
  • GithubContributionSummaryCollection : Describes data format
  • GraphQLContributionSummaryResponse: Describes Response format
• Update Type name: GraphQLMetricsRespons to GraphQLContributionCalendarMetricsResponse
• Update method name: fetchGitHubMetrics to fetchUserGitHubContributionCalendarMetrics

API GET /api/github/contribution_summary
Reponse:

{
"contributionSummary": {
"totalCommitContributions": 1967,
"totalIssueContributions": 20,
"totalPullRequestContributions": 503,
"totalPullRequestReviewContributions": 305,
"totalRepositoriesWithContributedPullRequests": 13,
"totalRepositoriesWithContributedIssues": 5,
"totalRepositoriesWithContributedPullRequestReviews": 5,
"totalRepositoriesWithContributedCommits": 14
}
}