Feature Request - Total Count for PagedIterable

[bchenghi]

I believe the GitHub API provides total number of pages in the response's Link header.

This could be useful, for instance, counting total number of commits in a repository. We can set page_size to 1 for listing commits on a GHRepository. Obtaining the total number of pages would tell us the total number of commits.

[bitwiseman]

Part of #348. But let's keep this open for clarity.

[antrix190]

@bitwiseman is it available for development or already handled?

[bitwiseman]

@antrix190
Available for development.

[khagenbaro]

Hi . I want to work on this issue.