[trunk-sim] sql/stats: improve SHOW STATISTICS with merged and forecasted stats (#666)

## Simulation PR for trunk Merge Queue

This PR simulates the behavior of original PR 155615 from timeline.

### Original PR Details
- **Title**: sql/stats: improve SHOW STATISTICS with merged and forecasted stats
- **Author**: Uzair5162
- **Base Branch**: master

### Simulation Details
- **Vendor**: trunk
- **Target Base**: master-trunk
- **Simulation Time**: 2025-12-01T14:08:53+05:30

### Timeline Replication
This PR will replicate the timing patterns from the original PR with time compression applied.

---
*This is an automated simulation PR for merge queue vendor comparison.*

Author: rishabh7m

simulation-readme-20251201-140849.md

@@ -0,0 +1,27 @@
+# PR Simulation README
+
+## Simulation Details
+- **Timestamp**: 2025-12-01T14:08:49+05:30
+- **Original PR**: #155615
+- **Original Title**: sql/stats: improve SHOW STATISTICS with merged and forecasted stats
+- **Original Author**: Uzair5162
+- **Original URL**: https://github.com/cockroachdb/cockroach/pull/155615
+
+## Original PR Timeline
+- **Created**: 2025-10-17T13:33:47Z
+- **Queue Entry**: N/A
+- **CI Start**: N/A
+- **CI Completion**: N/A
+- **Merged**: 2025-10-17T18:32:23Z
+
+## Simulation Purpose
+This PR is part of a merge queue vendor comparison simulation.
+It replicates the timing and behavior of the original PR for testing purposes.
+
+## Timing Information
+- **CI Wait Duration**: N/A
+- **CI Run Duration**: N/A  
+- **Total Queue Duration**: N/A
+
+---
+*Generated by pr-simulation tool at 2025-12-01T14:08:50+05:30*