Fix #793. Generate all input/output/error serde helpers in server codegen (#794)

codegen-server-test/build.gradle.kts

.../smithy/rust/codegen/server/smithy/protocols/RestJson1.kt

...ust/codegen/smithy/protocols/parse/JsonParserGenerator.kt

...n/smithy/protocols/parse/StructuredDataParserGenerator.kt

.../smithy/protocols/parse/XmlBindingTraitParserGenerator.kt

...smithy/protocols/serialize/AwsQuerySerializerGenerator.kt

...smithy/protocols/serialize/Ec2QuerySerializerGenerator.kt

...gen/smithy/protocols/serialize/JsonSerializerGenerator.kt

.../protocols/serialize/StructuredDataSerializerGenerator.kt

...protocols/serialize/XmlBindingTraitSerializerGenerator.kt