Implement request ID access for SDK clients RFC (#2129)

* Add `RequestId` trait
* Implement `RequestId` for generated AWS client errors
* Move `RustWriter.implBlock` out of `StructureGenerator`
* Create structure/builder customization hooks
* Customize `_request_id` into AWS outputs
* Set request ID on outputs
* Refactor SDK service decorators
* Refactor S3's extended request ID implementation
* Combine `Error` and `ErrorKind`
* Add test for service error conversion
* Move error generators into `codegen-client` and fix tests
* Re-export `ErrorMetadata`
* Add request IDs to trace logs
* Simplify some error trait handling
* Rename `ClientContextParamDecorator` to `ClientContextConfigCustomization`
* Add deprecated alias to guide customers through upgrading
* Rename the `ErrorMetadata` trait to `ProvideErrorMetadata`
* Rename `aws_smithy_types::Error` to `ErrorMetadata`