fix(amazonq): add range field to indicate partial doc change

[andrewyuq]

For the LSP's TextDocumentContentChangeEvent, if range is not specified, LSP would assume the contentChange is for the whole file and replace the file content with it, so if user is just making edits we need to specify range other wise file content will be replaced by this diff.

Types of changes

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

Description

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.