feat: add more tool input types to mcpgen

Add 18 additional tool input types with SchemaProvider implementations:
- SearchIssuesInput, SearchPullRequestsInput
- ListCommitsInput, GetCommitInput
- ListBranchesInput, ListTagsInput
- ListReleasesInput, GetReleaseByTagInput
- ListWorkflowsInput, ListWorkflowRunsInput, GetWorkflowRunInput
- ListNotificationsInput, GetRepositoryTreeInput
- CreateBranchInput, CreateOrUpdateFileInput, PushFilesInput
- ForkRepositoryInput, CreateRepositoryInput

Generated file now has 1186 lines with zero-reflection schemas for 24 tool input types.

Co-authored-by: SamMorrowDrums <[email protected]>

Author: Copilot