Unwanted logs after applying tower middleware

## Bug Report
- After following the instructions at https://github.com/hyperium/tonic/blob/master/examples/src/tower/server.rs to add middleware to my service, everything works fine except that there are unwanted logs appearing.

- 2022-08-30T08:20:42.614509+07:00 DEBUG h2::codec::framed_write - send frame=Settings { flags: (0x0), initial_window_size: 1048576, max_frame_size: 16384, max_header_list_size: 16777216 }
- 2022-08-30T08:20:42.615164+07:00 DEBUG h2::proto::connection - Connection; peer=Server
- 2022-08-30T08:20:42.615391+07:00 DEBUG h2::codec::framed_read - received frame=Settings { flags: (0x0), enable_push: 0, initial_window_size: 65535 }
- 2022-08-30T08:20:42.615461+07:00 DEBUG h2::codec::framed_write - send frame=Settings { flags: (0x1: ACK) }
- 2022-08-30T08:20:42.615524+07:00 DEBUG h2::codec::framed_read - received frame=WindowUpdate { stream_id: StreamId(0), size_increment: 67043329 }
- 2022-08-30T08:20:42.615801+07:00 DEBUG h2::codec::framed_read - received frame=Headers { stream_id: - StreamId(1), flags: (0x4: END_HEADERS) }
- 2022-08-30T08:20:42.616069+07:00 DEBUG h2::codec::framed_read - received frame=Data { stream_id: StreamId(1) }
- 2022-08-30T08:20:42.616169+07:00 DEBUG h2::codec::framed_read - received frame=Data { stream_id: StreamId(1), flags: (0x1: END_STREAM) }
- 2022-08-30T08:20:42.616234+07:00 DEBUG h2::codec::framed_read - received frame=Settings { flags: (0x1: ACK) }
- 2022-08-30T08:20:42.616275+07:00 DEBUG h2::proto::settings - received settings ACK; applying Settings { flags: (0x0), initial_window_size: 1048576, max_frame_size: 16384, max_header_list_size: 16777216 }
- 2022-08-30T08:20:42.616369+07:00 DEBUG h2::codec::framed_write - send frame=WindowUpdate { stream_id: StreamId(0), size_increment: 983041 }

I really do not know where the logs come from. It appears to me that the logs show details of the gRPC requests and responses.

### Version
tower = "0.4.13"
futures = "0.3.24"
tokio = { version = "1.20.1", features = [ "rt-multi-thread", "time", "fs", "macros", "net",] }
tonic = "0.8"
hyper = "0.14.20"
tower-service = "0.3.2"

### Platform
macOS