Add ability to configure aws-sdk-go-v2 token bucket rate limiter capacity

[ewbankkit]

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Description

Add the ability to configure the capacity of the aws-sdk-go-v2 token bucket RateLimiter.

Relates #915.
Relates hashicorp/terraform-provider-aws#34669.

provider "aws" {
  token_bucket_rate_limiter_capacity = 100000
}