feat: add ListTeamsOptions with type filter for ListTeams

[turanalmammadov]

Summary

The GitHub Teams API now returns a type field and supports filtering teams by ownership type to distinguish between organization-level and enterprise-level teams (see changelog announcement).

The type field was already added to the Team struct. This PR adds the ability to filter by team type when listing teams:

Changes

• ListTeamsOptions — new struct embedding ListOptions with a Type field accepting:
  • "all" — returns all teams (default)
  • "organization" — returns only organization-level teams
  • "enterprise" — returns only enterprise-level teams
• ListTeams updated to accept *ListTeamsOptions instead of *ListOptions
• ListTeamsIter updated to match
• Tests added for the new type filter behavior

Usage

// List only enterprise teams
teams, _, err := client.Teams.ListTeams(ctx, "my-org", &github.ListTeamsOptions{
    Type: "enterprise",
})

Closes #4033

Made with Cursor

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[gmlewis]

@turanalmammadov - #4037 already closed #4033. I think we can close this PR.
Please read CONTRIBUTING.md and note that we appreciate it when people comment on issues that they wish to work on it, mainly to avoid duplicated effort.