feat: add easymotionOnlyVisibleRange option to restrict markers to visible content

[re0312]

What this PR does / why we need it:

This PR adds a new configuration option vim.easymotionOnlyVisibleRange that restricts EasyMotion markers to only visible content in the editor, ignoring folded/collapsed code sections.

Key changes:

• Added vim.easymotionOnlyVisibleRange configuration option (default: false)
• Modified EasyMotion's sortedSearch method to check VS Code's visibleRanges when the option is enabled
• Updated type definitions and method signatures to support the new functionality
• Maintains full backward compatibility - existing behavior is unchanged when option is disabled

Which issue(s) this PR fixes

fixes #8112

Special notes for your reviewer: