message: Allow both teams to release new smithy-rs versions independently
  This commit modifies the `CODEOWNERS` to allow both
  `@awslabs/rust-sdk-owners` and `@awslabs/smithy-rs-server` teams to
  release new versions of smithy-rs independently, without requiring peer
  approval from the other team.
  Syntax and semantics of `CODEOWNERS`:
diff: /codegen-server-test/ @awslabs/smithy-rs-server
  /rust-runtime/aws-smithy-http-server/ @awslabs/smithy-rs-server
  /rust-runtime/aws-smithy-http-server-python/ @awslabs/smithy-rs-server
  +
  +# Either team is able to modify this file to release new smithy-rs versions.
  +gradle.properties @awslabs/rust-sdk-owners @awslabs/smithy-rs-server
  