Add `@awslabs/smithy-rs-server` as owners to `codegen-core` (#1739)

*                                               @awslabs/rust-sdk-owners

/buildSrc/                                      @awslabs/rust-sdk-owners @crisidev @david-perez

/codegen-core/                                  @awslabs/rust-sdk-owners @crisidev @david-perez

/codegen-server/                                @awslabs/smithy-rs-server

# Server

/codegen-server-test/                           @awslabs/smithy-rs-server

/rust-runtime/aws-smithy-http-server/           @awslabs/smithy-rs-server

/codegen-server/                                @awslabs/smithy-rs-server

/rust-runtime/aws-smithy-http-server-python/    @awslabs/smithy-rs-server

/rust-runtime/aws-smithy-http-server/           @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

# Shared ownership

/CHANGELOG.md                                   @awslabs/rust-sdk-owners @awslabs/smithy-rs-server

/CHANGELOG.next.toml                            @awslabs/rust-sdk-owners @awslabs/smithy-rs-server

/README.md                                      @awslabs/rust-sdk-owners @awslabs/smithy-rs-server

/build.gradle.kts                               @awslabs/rust-sdk-owners @awslabs/smithy-rs-server

/buildSrc/                                      @awslabs/rust-sdk-owners @awslabs/smithy-rs-server

/codegen-core/                                  @awslabs/rust-sdk-owners @awslabs/smithy-rs-server

/design/                                        @awslabs/rust-sdk-owners @awslabs/smithy-rs-server

/gradle.properties                              @awslabs/rust-sdk-owners @awslabs/smithy-rs-server

/tools/                                         @awslabs/rust-sdk-owners @awslabs/smithy-rs-server