Target ES2018 for commonjs packages

[trivikr]

Is your feature request related to a problem? Please describe.
We're now targeting Node.js >=10.0.0: #1558

Node.js >10.0.0 supports 100% of ES2018:

• StackOverflow: https://stackoverflow.com/a/57607634
• TSConfig: https://www.typescriptlang.org/tsconfig#target

The tsconfig.json in clients still target "es2017":

aws-sdk-js-v3/clients/client-accessanalyzer/tsconfig.json

Line 4 in cbdec42

"target": "es2017",

Describe the solution you'd like
Target "ES2018" as we support Node.js >=10.0.0, so that cjs bundle size reduces.

Describe alternatives you've considered
Sticking with target ES2017, as it runs on Node.js >=10.0.0.

[trivikr]

PRs:

• clients were updated in chore: target ES2018 in clients #1560
• packages were updated in chore: target ES2018 in packages #1562

[github-actions]

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