aws / aws-sdk-ruby / 2003

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Initial Pass for Shared Configuration Support

This change adds the `Aws::SharedConfig` file, which parses both the
Shared Credentials file and the Shared Config file. From that, functions
are provided to support:

* Credentials from shared credentials or shared config.
* Default region selection from shared config.
* Assume role credentials from shared config.

Shared config support is toggled behind the `AWS_SDK_LOAD_CONFIG`
environment variable.

Assume role credentials support is working, but not yet wired in to any
default credential provider chain. I'd also still like to test edge
cases, as CLI configuration supports many more values than the shared
credential file.

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