feat(amazonq): pass featureConfigs for ViewDiffInChat

[leigaol]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Support ViewDiffInChat.
Ref:
https://github.com/aws/aws-toolkit-vscode/blob/master/packages/core/src/amazonq/webview/ui/main.ts#L1078-L1113

This PR depends on #5683

Description

This was done by lift and shift the vs code webview implementation.

Checklist

• My code follows the code style of this project
• I have added tests to cover my changes
• A short description of the change has been added to the CHANGELOG if the change is customer-facing in the IDE.
• I have added metrics for my changes (if required)

License

I confirm that my contribution is made under the terms of the Apache 2.0 license.