eliminates unnecessary ping when the connection is idle

[HuSharp]

Version
master

Platform
Linux 5.4.0-154-generic #171-Ubuntu SMP Fri Jun 16 16:29:04 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

Description
Setting PermitWithoutStream to false on the client side eliminates the need to send pings when the connection is idle.

otherwise output too many ping

can check code here https://github.com/grpc/grpc-go/blob/70f1a4045da95b93f73b6dbdd7049f3f053c0680/internal/transport/http2_server.go#L891-L894

grpc-client will check https://github.com/grpc/grpc-go/blob/70f1a4045da95b93f73b6dbdd7049f3f053c0680/internal/transport/http2_client.go#L1685-L1693

I tried this code:

maybe need to check idle here

fn maybe_ping(&mut self, cx: &mut task::Context<'_>, is_idle: bool, shared: &mut Shared) {
        match self.state {
            KeepAliveState::Scheduled(at) => {
                ...
                if !self.while_idle && is_idle {
                    trace!("keep-alive while idle disabled");
                    return;
                }
               ...
            }
            KeepAliveState::Init | KeepAliveState::PingSent => (),
        }
    }

I expected to see this happen: [explanation]
do not output too many ping

Instead, this happened: [explanation]
unnecessary ping from client side