validate configuration file for quoted strings

[kdaily]

Is your feature request related to a problem? Please describe.

Originally reported at https://github.com/aws/aws-cli/issues/5332.

User reported trouble with using the configuration option cli_pager. They were trying to turn it off and set it to:

cli_pager = ""

This failed with a cryptic error:

[Errno 13] Permission denied: ''

If quotes are added to other fields, they can also fail with different errors. For example, quoting the region leads to the following error:

Invalid endpoint: https://ec2."us-west-2".amazonaws.com

While the error is easier to see, it's not immediately clear that it's from a improperly formatted configuration file.

Describe the solution you'd like

Validation of the configuration file such that values do not start with quotes. If quotes are an allowed value, then possibly a warning about it.

[github-actions[bot]]

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