Update example code to use write_all_buf method

[LMJW]

Small PR, related to #349
*This PR updated the example code to use the lastest supported method write_all_buffrom AsyncWriteExt trait (tokio-rs/tokio#3737) to make example less verbose *

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Test: ./gradlew :aws:sdk:test passed locally.

BUILD SUCCESSFUL in 8m 41s

Please let me know if you have any feedbacks. Thanks!

[rcoh]

LGTM! Can you change the Tokio dependency in smithy-http to 1.6? That will ensure that this builds for everyone

[LMJW]

Absolutely. Let me do that.

[LMJW]

Test:

• Rerun ./gradlew :aws:sdk:assemble
• Run ./gradlew :aws:sdk:cargoCheck
• Run ./gradlew :aws:sdk:test BUILD SUCCESSFUL in 7m 52s

All successful.

[rcoh]

LGTM. Thanks for your contribution!

[rcoh]

Looks like the build failed for a cargofmt check—can you run cargo fmt in the polly synthesize speech example? I will document that more clearly in the contribution docs

[LMJW]

Okay. Let me update it. I thought the test would have caught the fmt failure :P. But I guess I should've run cargo fmt after I made the change. :)

[rcoh]

yeah I think that's an oversight that I'll fix. In the future, installing pre-commit will run all of our precommit hooks (including cargo fmt)

[LMJW]

Just updated.
Rerun ./gradlew :aws:sdk:assemble
Run ./gradlew :aws:sdk:cargoCheck
Run ./gradlew :aws:sdk:test BUILD SUCCESSFUL in 7m 55s

[LMJW]

Hi @rcoh Looks like the workflow needs to be approved to run