feat(clients): change runtime config from constant to provider functions

[AllanZhengYP]

Issue

Resolves #2557

Description

This change makes runtime default configs as a function instead of constant. As a result, different client instance won't share the same runtime config (e.g. HTTP handlers). This change also uses inline nullish coalescing in replace of fully loaded default configuration. This change makes sure the SDK won't load default value/provider at all when corresponding custom config is supplied.

This change may increase the code size because each nullish coalescing operator is transcribed to more inline code. However the difference is unnoticeable, tested on a React project with only S3 and GetObject command.

Testing

• unit test
• manual test(S3, ACM)
• API reference

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[codecov-commenter]

Codecov Report

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  Hits            ?    16744           
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[AllanZhengYP]

Looks like the protocol tests are failed because they don't have region in the runtime config, but got was validated in resolveRegionConfig. Possibly because the region config not needed for non-AWS clients but required for SigV4 signer.

[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 37212cc
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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