[Internal] LINQ: Adds typed CompileLambda<TDelegate> overload and memory benchmark

[Ofekw]

Changes

1. Typed \CompileLambda\ overload

Adds a generic overload to \ExpressionCompileHelper\ that preserves the delegate type, eliminating casts at call sites in \Utilities.cs\ and \GeometrySqlExpressionFactory.cs.

2. Memory benchmark with [MemoryDiagnoser]\

Replaces the previous custom native-memory benchmark infrastructure with a simple [MemoryDiagnoser]-annotated benchmark. Includes:

• *[MemoryDiagnoser]* for managed GC allocation reporting (Gen0/Gen1/Allocated columns)
• *[GlobalSetup]/[GlobalCleanup]* that snapshots and prints process private-byte delta for native memory visibility
• *\OperationsPerInvoke = 2000* inner loop to exceed BenchmarkDotNet's 100ms iteration floor

Benchmark results (Default job)

\\

Method	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
CompileBaseline	119.759 us	2.3833 us	2.3407 us	1.00	0.5000	4.23 KB	1.00
EvaluateWithFix	1.760 us	0.0345 us	0.0567 us	0.01	0.1504	1.27 KB	0.30
\\

Key findings:

• 68x faster per-operation (0.01 ratio)
• 70% less managed allocation (1.27 KB vs 4.23 KB)
• Gen1 GC pressure eliminated — baseline triggers Gen1 collections, fix does not
• Native memory: \GlobalCleanup\ prints private-byte delta showing leak accumulation in baseline

Note: [MemoryDiagnoser]\ tracks managed GC allocations only. The native memory leak from \DynamicMethod\ IL emission (the real issue in #5487) is not visible through \MemoryDiagnoser\ but is confirmed by the throughput differential and the [NativeMemory]\ console output.

Files changed

• \ExpressionCompileHelper.cs\ — Added typed \CompileLambda\ overload with XML doc
• \Utilities.cs\ — Removed cast, uses typed overload
• \GeometrySqlExpressionFactory.cs\ — Removed cast, uses typed overload
• \SubtreeEvaluatorBenchmark.cs\ — Simplified benchmark with [MemoryDiagnoser]\ + native memory tracking

[kirankumarkolli]

Duplicate of #5588