Add copy functionality to JsonView component

[ln-12]

This pull request adds a copy button to each element in the JsonView component. Fixes #658.

Motivation and Context

As explained in #658 it feels a bit cumbersome to copy values from the JsonView component, especially if the string takes up multiple lines.

How Has This Been Tested?

I tested different JSON responses with my changes and copied the value.

Breaking Changes

No

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally (actually no, the same tests as on the main branch are failing)
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

No