fix(credential-provider-ini): add DurationSeconds to assumeRole params

[RanVaknin]

Issue

#4589

Description

This expands the assume role interface to be able to read DurationSeconds that is already provided by the ini file. Until now that value was not read even though it was technically available to consume, thus preventing from explicitly setting a duration on the session.

Reproduction:

ini file:

[profile myrole]
role_arn=arn:aws:iam::1234567890123:role/my_role
duration_seconds=1534
source_profile=default

[default]
aws_access_key_id = YOUR_ACCESS_KEY
aws_secret_access_key = YOUR_SECRET_ACCESS_KEY
region = us-east-1

repro code:

import { decorateDefaultCredentialProvider } from '@aws-sdk/client-sts'
import { defaultProvider } from '@aws-sdk/credential-provider-node'

const provider = decorateDefaultCredentialProvider(defaultProvider)({})
const now = Date.now()
provider()
  .then((credentials) => {
    console.log(credentials)
    console.log(((credentials.expiration?.valueOf() ?? now) - now) / 1_000)
})

Output before change:

$ AWS_PROFILE=myrole node test.mjs                                                                
{
  accessKeyId: 'REDACTED',
  secretAccessKey: 'REDACTED',
  sessionToken: 'REDACTED',
  expiration: 2023-07-07T23:58:12.000Z
}
3599.726

Ouput after change:

$ AWS_PROFILE=myrole node test.mjs       
{
  accessKeyId: 'REDACTED',
  secretAccessKey: 'REDACTED',
  sessionToken: 'REDACTED',
  expiration: 2023-07-07T23:24:30.000Z
}
1534.216

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