[Enhancement]: Performance benchmarking and monitoring tools

**Problem Statement:**
Need systematic performance monitoring to track ORM overhead, identify bottlenecks, and compare against raw bun:sqlite performance.

**Proposed Solution:**
Create comprehensive benchmarking suite:

\`\`\`bash
# Benchmark CLI
bun orm benchmark --operations=1000 --entities=User,Post
bun orm benchmark --compare-raw-sqlite
bun orm benchmark --profile-memory
bun orm benchmark --export-results=./benchmarks/

# Results output
┌─────────────────┬──────────┬─────────┬──────────┐
│ Operation │ ORM │ Raw SQL │ Overhead │
├─────────────────┼──────────┼─────────┼──────────┤
│ Insert (1000) │ 45ms │ 32ms │ 40% │
│ Select (1000) │ 23ms │ 18ms │ 28% │
│ Update (1000) │ 38ms │ 29ms │ 31% │
└─────────────────┴──────────┴─────────┴──────────┘
\`\`\`

**Benchmark Categories:**
- CRUD operations (insert, select, update, delete)
- Bulk operations (insertMany, updateAll, deleteAll)
- Complex queries with relations
- Memory usage profiling
- Statement caching effectiveness
- Transaction performance
- Comparison with raw bun:sqlite
- Regression testing over time

**Features:**
- CLI benchmarking tool
- Automated performance regression detection in CI
- Memory leak detection
- Performance monitoring dashboard
- Historical performance tracking

The issue names no files, tests, or existing entry points; begin by locating the ORM's CLI and current benchmark or CI configuration. Done would require the listed CRUD, bulk, relation, memory, caching, transaction, and raw bun:sqlite comparisons, plus regression detection, export/history, and monitoring capabilities.

Written by the indexing model from the issue text.