feat: export folders from index.ts

[trivikr]

Issue #, if available:
N/A

Description of changes:
Exports folders from index.ts

Testing:
Verified the ssdk tests contain operations/index.ts which exports all operations.

Console

$ cat protocol_tests/aws-restjson-server/src/server/index.ts 
export * from "./RestJsonService";
export * from "./operations";

$ head protocol_tests/aws-restjson-server/src/server/operations/index.ts
export * from "./AllQueryStringTypes";
export * from "./ConstantAndVariableQueryString";
export * from "./ConstantQueryString";
export * from "./DocumentType";
export * from "./DocumentTypeAsPayload";
export * from "./EmptyInputAndEmptyOutput";
export * from "./EndpointOperation";
export * from "./EndpointWithHostLabelOperation";
export * from "./GreetingWithErrors";
export * from "./HostWithPathOperation";

$ tree protocol_tests/aws-restjson-server/
protocol_tests/aws-restjson-server/
├── jest.config.js
├── LICENSE
├── package.json
├── src
│   ├── index.ts
│   ├── models
│   │   ├── index.ts
│   │   └── models_0.ts
│   ├── protocols
│   │   └── Aws_restJson1.ts
│   └── server
│       ├── index.ts
│       ├── operations
│       │   ├── AllQueryStringTypes.ts
│       │   ├── ConstantAndVariableQueryString.ts
│       │   ├── ConstantQueryString.ts
│       │   ├── DocumentTypeAsPayload.ts
│       │   ├── DocumentType.ts
│       │   ├── EmptyInputAndEmptyOutput.ts
│       │   ├── EndpointOperation.ts
│       │   ├── EndpointWithHostLabelOperation.ts
│       │   ├── GreetingWithErrors.ts
│       │   ├── HostWithPathOperation.ts
│       │   ├── HttpChecksumRequired.ts
│       │   ├── HttpEnumPayload.ts
│       │   ├── HttpPayloadTraits.ts
│       │   ├── HttpPayloadTraitsWithMediaType.ts
│       │   ├── HttpPayloadWithStructure.ts
│       │   ├── HttpPrefixHeadersResponse.ts
│       │   ├── HttpPrefixHeaders.ts
│       │   ├── HttpRequestWithFloatLabels.ts
│       │   ├── HttpRequestWithGreedyLabelInPath.ts
│       │   ├── HttpRequestWithLabelsAndTimestampFormat.ts
│       │   ├── HttpRequestWithLabels.ts
│       │   ├── HttpResponseCode.ts
│       │   ├── HttpStringPayload.ts
│       │   ├── IgnoreQueryParamsInResponse.ts
│       │   ├── index.ts
│       │   ├── InputAndOutputWithHeaders.ts
│       │   ├── JsonBlobs.ts
│       │   ├── JsonEnums.ts
│       │   ├── JsonLists.ts
│       │   ├── JsonMaps.ts
│       │   ├── JsonTimestamps.ts
│       │   ├── JsonUnions.ts
│       │   ├── MalformedAcceptWithBody.ts
│       │   ├── MalformedAcceptWithGenericString.ts
│       │   ├── MalformedAcceptWithPayload.ts
│       │   ├── MalformedBlob.ts
│       │   ├── MalformedBoolean.ts
│       │   ├── MalformedByte.ts
│       │   ├── MalformedContentTypeWithBody.ts
│       │   ├── MalformedContentTypeWithGenericString.ts
│       │   ├── MalformedContentTypeWithoutBody.ts
│       │   ├── MalformedContentTypeWithPayload.ts
│       │   ├── MalformedDouble.ts
│       │   ├── MalformedFloat.ts
│       │   ├── MalformedInteger.ts
│       │   ├── MalformedList.ts
│       │   ├── MalformedLong.ts
│       │   ├── MalformedMap.ts
│       │   ├── MalformedRequestBody.ts
│       │   ├── MalformedSet.ts
│       │   ├── MalformedShort.ts
│       │   ├── MalformedString.ts
│       │   ├── MalformedTimestampBodyDateTime.ts
│       │   ├── MalformedTimestampBodyDefault.ts
│       │   ├── MalformedTimestampBodyHttpDate.ts
│       │   ├── MalformedTimestampHeaderDateTime.ts
│       │   ├── MalformedTimestampHeaderDefault.ts
│       │   ├── MalformedTimestampHeaderEpoch.ts
│       │   ├── MalformedTimestampPathDefault.ts
│       │   ├── MalformedTimestampPathEpoch.ts
│       │   ├── MalformedTimestampPathHttpDate.ts
│       │   ├── MalformedTimestampQueryDefault.ts
│       │   ├── MalformedTimestampQueryEpoch.ts
│       │   ├── MalformedTimestampQueryHttpDate.ts
│       │   ├── MalformedUnion.ts
│       │   ├── MediaTypeHeader.ts
│       │   ├── NoInputAndNoOutput.ts
│       │   ├── NoInputAndOutput.ts
│       │   ├── NullAndEmptyHeadersClient.ts
│       │   ├── NullAndEmptyHeadersServer.ts
│       │   ├── OmitsNullSerializesEmptyString.ts
│       │   ├── QueryIdempotencyTokenAutoFill.ts
│       │   ├── QueryParamsAsStringListMap.ts
│       │   ├── QueryPrecedence.ts
│       │   ├── RecursiveShapes.ts
│       │   ├── SimpleScalarProperties.ts
│       │   ├── StreamingTraitsRequireLength.ts
│       │   ├── StreamingTraits.ts
│       │   ├── StreamingTraitsWithMediaType.ts
│       │   ├── TestBodyStructure.ts
│       │   ├── TestNoPayload.ts
│       │   ├── TestPayloadBlob.ts
│       │   ├── TestPayloadStructure.ts
│       │   └── TimestampFormatHeaders.ts
│       └── RestJsonService.ts
├── test
│   └── functional
│       └── restjson1.spec.ts
├── tsconfig.es.json
├── tsconfig.json
└── tsconfig.types.json

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[AllanZhengYP]

Thank you for adding it!