Obey the `expireCredentialsAfter` in CachedCredentialsProvider

[lauzadis]

Describe the issue

CachedCredentialsProvider has a field called expireCredentialsAfter which allows the user to specify a maximum amount of time to wait before refreshing credentials. It defaults to 15 minutes.

Currently, we do not use this field when we receive credentials with a non-null expiration time. So, if the default expireCredentialsAfter are used and we receive credentials with an expiration 30 minutes from now, we will only refresh them after those 30 minutes, but they should be refreshed after only 15 minutes.

Steps to Reproduce

• Create a CachedCredentialsProvider with expireCredentialsAfter time of 0 seconds
• Mock receiving some credentials with an expiration time sometime in the near future (i.e 5 mins, 10 mins, 30 mins)
• Try to getCredentials again. They will not be refreshed, you will be served the cached value

Current behavior

N/A

AWS Kotlin SDK version used

N/A

Platform (JVM/JS/Native)

N/A

Operating System and version

N/A

[lauzadis]

Closed by #719

[github-actions]

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