feat: add copy text to ls client wrapper

What does this MR do and why?

This MR introduces a copyText method that allows the LSP to copy a given text and display a copy message when utilized.

Related Issues

• LSP 1121 - Duo Workflow - Add Copy Workflow ID to top navigation bar

Related MR & Testing

• LSP gitlab-org/editor-extensions/gitlab-lsp!1740 (merged) | Use for testing.

Screen Recording

<TODO: Add Recording>

What CHANGELOG entry will this MR create?

• fix: Bug fix fixes - a user-facing issue in production - included in changelog
• feature: New feature - a user-facing change which adds functionality - included in changelog
• BREAKING CHANGE: (fix or feature that would cause existing functionality to change) - should bump major version, mentioned in the changelog
• None - other non-user-facing changes