Add tool to create repository from template

[crondinini]

Description

Adds a "Create Repository From Template" tool that follows the established pattern from the existing "Create Repository" tool. I did not find any existing issue to link here.

This functionality was implemented as a separate tool rather than extending the existing "Create Repository" tool for two main reasons:

1. The requirements for template-based repository creation differ significantly from standard repository creation
2. The Go GitHub client library itself uses distinct methods for these operations, reinforcing this separation of concerns

Video

Walkthrough of the tool being used in Cursor

walkthrough.mp4

[Copilot]

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

pkg/github/repositories.go:454

• Consider ensuring that resp.Body is closed in all cases, including when an error is returned from CreateFromTemplate, to avoid potential resource leaks.

createdRepo, resp, err := client.Repositories.CreateFromTemplate(ctx, templateOwner, templateRepo, templateReq)