feat(clients): add retryModeProvider in runtimeConfig

[trivikr]

Issue

Internal JS-2635

Description

Adds retryModeProvider in runtimeConfig for clients.
This provider is going to be used in middleware-retry to call adaptive retry strategy if provided in the environment or shared ini configurations.

Testing

Testing will be done when middleware-retry is updated.

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[alexforsyth]

Can you link the smithy typescript PR?

[trivikr]

Can you link the smithy typescript PR?

There is no equivalent PR in smithy-typescript, as retryModeProvider is specific to AWS clients.
The codegen changes are in AddAwsRuntimeConfig.java

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