[FEAT]: github_team_members support for no team members

[simontabor]

Describe the need

We have teams where we want to enforce no direct members (membership through child teams only).

We are unable to enforce this as we cannot use github_team_members resources with no members present.

The only way to ensure there are no members would be to constantly import the team_members and then delete the resource, which feels wrong.

Proposal

resource "github_team_members" "no_team_members" {
  team_id  = github_team.some_team.id
}

Alternative

resource "github_team_members" "no_team_members" {
  team_id  = github_team.some_team.id
  no_members = true # just in case we want it explicit
}

SDK Version

No response

API Version

No response

Relevant log output

No response

Code of Conduct

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