fix: Fix config set

[mitchnegus]

Pull Request Title

Description

The firewheel config set -s ... command does not properly handle whitespace. It takes arguments from the command line and splits them using whitespace (ignoring CLI indicators like quoted parameters). Instead of using the str.split method, the ConfigureFirewheel object (and the underlying Config object) should use shlex.split.

Related Issue

See related discussion on #166.

Type of Change

Please select the type of change your pull request introduces:

• Bugfix
• New feature
• Documentation update
• Other (please describe):

Checklist

• This PR conforms to the process detailed in the Contributing Guide.
• I have included no proprietary/sensitive information in my code.
• I have performed a self-review of my code.
• N/A I have commented my code, particularly in hard-to-understand areas.
• N/A I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have tested my code.

[sdelliot]

LGTM