ExponentialBackOffStrategy class constructor parameter should be a hash

[AllanZhengYP]

Is your feature request related to a problem? Please describe.
Currently the constructor expects 3 individual variable, instead of one single hash. This is error prone and not aligned with other constructors in the SDK.

aws-sdk-js-v3/packages/middleware-retry/src/defaultStrategy.ts

Lines 37 to 41 in bcfa99c

	constructor(
	public readonly maxRetries: number,
	private retryDecider: RetryDecider = defaultRetryDecider,
	private delayDecider: DelayDecider = defaultDelayDecider
	) {}

Describe the solution you'd like
The parameter should be

export interface StrategyOption {
    maxRetry: number,
    private retryDecider?: RetryDecider, 
    private delayDecider?: DelayDecider
}

/cc @trivikr

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