feat(clients): generate service exceptions as classes

[AllanZhengYP]

Issue

#1506
#2007

Associated with smithy-lang/smithy-typescript#502
Followup to #3261

Description

Generate server-side exceptions as classes extended from ServiceException base class. Now you can handle individual service exceptions without hardcoding the error code:

import { ResourceNotFoundException, ServiceException, FooServiceException } from "@aws-sdk/client-foo";

try {
    await client.send(operation);
} catch (e) {
    if (e instanceof ResourceNotFoundException) {
    // Handle resource not found exception
    } else if (e instanceof FooServiceException) {
    // Handle all other service exceptions
    } else {
    // Handle errors from SDK
    }
}

Testing

• Integration Test
• Unit test
• Protocol Test
• API Reference Generation

yarn test:integration:legacy
yarn run v1.22.17
$ cucumber-js --fail-fast
.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

150 scenarios (150 passed)
523 steps (523 passed)
1m40.999s
Done in 102.91s.

Additional context

Add any other context about the PR here.

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[keverall]

aws/aws-sdk-js-team please review and fix it so we don't have to use the horrible ANY type on Cognito error any longer.

[moltar]

Amazing! Can't wait for this to be released, so we don't have to mess around with typecasting and other error-prone solutions.

[trivikr]

Thank you!

[github-actions]

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