Sending large packets is slow (on the client)
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- Rust
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Description
## Bug Report
I've only made a minor modification to the `helloworld` sample so the message takes bytes instead of a string. Then I send it around 2G of data in a single packet. Tonic seems to spend a significant time (much more then would be the norm for a normal 2GB memcpy) moving this data around.
Ideally it should just zero-copy / move the data into the OS.
Minimal repro attached
[tonic-repro.zip](https://github.com/hyperium/tonic/files/4638706/tonic-repro.zip)
Relates to #352 as well
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