Add show_seat_info option to ProjectMembers.ListAllProjectMembers()

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The List all members of a group or project including inherited and invited members endpoint of the Group and project members API allows the usage of the show_seat_info boolean to include the is_using_seat boolean for each project member in the returned slice.

However, in the client_go package, this show_seat_info flag is not supported.

I propose to add support for this flag.

Implementation Guide

• Follow the CONTRIBUTING.md guide to get your local development environment set up.
• Add ShowSeatInfo to the ListGroupMembersOptions struct in group_members.go.
• Add IsUsingSeat to the GroupMember struct in group_members.go.
• Add ShowSeatInfo to the ListProjectMembersOptions struct in project_members.go.
• Add IsUsingSeat to the ProjectMember struct in project_members.go.
• Update unit tests in group_members_test.go and project_members_test.go.
• Run make reviewable to ensure the code is ready for review.