Add validation for config keys and filter list output

[bhouston]

Add Validation for Config Keys and Filter List Output

Description

This PR adds additional improvements to the config command implementation from PR #124:

1. Validation for Set Command: The set command now validates that the provided key exists in the default configuration, preventing users from setting invalid configuration keys.

2. Filtering for List Command: The list command now filters out any configuration keys that are not part of the default configuration, ensuring only valid keys are displayed.

Changes

Added

• Validation in the set command to check if the key exists in default config
• Filtering in the list command to only show valid configuration keys
• Tests for the new validation and filtering functionality

Testing

• Added unit tests for the new validation and filtering functionality
• Manual testing performed to verify correct behavior

This PR builds upon the changes in PR #124 and further addresses issue #117 by adding proper validation and filtering.

[github-actions]

🎉 This PR is included in version mycoder-v1.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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