Add closure resolution benchmark

[PhenX]

No description provided.

[Copilot]

Pull request overview

Adds a new BenchmarkDotNet benchmark to measure closure-capture overhead paths relevant to ProjectableExpressionReplacer.VisitMember, helping quantify costs of captured value fields vs captured subquery inlining within EF Core query translation.

Changes:

• Introduces ClosureCaptureBenchmark with two closure-capture scenarios (value closure + subquery closure) across baseline/full/limited modes.
• Adds “isolated” benchmarks that call ProjectableExpressionReplacer.Replace() directly to reduce EF Core pipeline noise.