Rename error generators (#2107)

.../software/amazon/smithy/rustsdk/AwsPresigningDecorator.kt

...smithy/rust/codegen/client/smithy/ClientCodegenVisitor.kt

...st/codegen/client/smithy/generators/PaginatorGenerator.kt

...rust/codegen/client/smithy/generators/ServiceGenerator.kt

.../client/smithy/generators/client/FluentClientGenerator.kt

...lient/smithy/generators/protocol/ProtocolTestGenerator.kt

...gen/client/smithy/protocols/HttpBoundProtocolGenerator.kt

...hy/rust/codegen/client/smithy/ClientCodegenVisitorTest.kt

...t/smithy/generators/protocol/ProtocolTestGeneratorTest.kt

...rotocols/eventstream/ClientEventStreamBaseRequirements.kt

...re/amazon/smithy/rust/codegen/core/rustlang/RustModule.kt

...thy/rust/codegen/core/smithy/EventStreamSymbolProvider.kt

...n/core/smithy/generators/error/OperationErrorGenerator.kt

...gen/core/smithy/generators/error/ServiceErrorGenerator.kt

...mithy/protocols/parse/EventStreamUnmarshallerGenerator.kt

...rotocols/serialize/EventStreamErrorMarshallerGenerator.kt

...smithy/rust/codegen/core/testutil/EventStreamTestTools.kt

...re/smithy/generators/error/OperationErrorGeneratorTest.kt

...core/smithy/generators/error/ServiceErrorGeneratorTest.kt

.../smithy/generators/PythonServerOperationErrorGenerator.kt