refactor: wrap setRequestHandler for high-level servers

[kashishhora]

Summary

Modified

• Refactored tracing architecture from per-tool callback wrapping to handler-level wrapping in tracingV2.ts
• Added setupToolsCallHandlerWrapping() to intercept setRequestHandler() calls for tools/call handler
• Added createToolsCallWrapper() to centralize tracing logic at the protocol handler level
• Simplified addTracingToToolCallback() to only remove context from args instead of handling full tracing

Test Plan

• All existing tests pass
• Type checks pass
• New tests added for handler-level architecture
• Tests verify no duplicate events when track() called multiple times
• Tests verify context parameter is properly removed before callback execution