implement paginated requestable roles listing (#56695) (#57939) (#59235)

Author: rudream

api/client/client.go

@@ -1869,6 +1869,16 @@ func (c *Client) ListRoles(ctx context.Context, req *proto.ListRolesRequest) (*p
 	return rsp, nil
 }
 
+// ListRequestableRoles is a paginated requestable role getter.
+func (c *Client) ListRequestableRoles(ctx context.Context, req *proto.ListRequestableRolesRequest) (*proto.ListRequestableRolesResponse, error) {
+	rsp, err := c.grpc.ListRequestableRoles(ctx, req)
+	if err != nil {
+		return nil, trace.Wrap(err)
+	}
+
+	return rsp, nil
+}
+
 // CreateRole creates a new role.
 func (c *Client) CreateRole(ctx context.Context, role types.Role) (types.Role, error) {
 	r, ok := role.(*types.RoleV6)