[Benchmark X64] [jkoritzinsky] Use a ReaderWriterLockSlim in RcwCache

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Job completed in 16 minutes 33 seconds (remote runner delay: 1 minute 22 seconds).

Using arguments: benchmark Interop.ComWrappersTests.ParallelRCWLookUp -medium -NoPRLink

Interop.ComWrappersTests

BenchmarkDotNet v0.14.1-nightly.20250107.205, Linux Ubuntu 22.04.5 LTS (Jammy Jellyfish)
AMD EPYC 9V74, 1 CPU, 8 logical and 4 physical cores
MediumRun : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
Job=MediumRun  OutlierMode=Default  IterationCount=15
LaunchCount=2  MemoryRandomization=Default  WarmupCount=10

Method	Toolchain	Mean	Error	Ratio	Allocated	Alloc Ratio
ParallelRCWLookUp	Main	395.9 ms	8.10 ms	1.00	1.66 KB	1.00
ParallelRCWLookUp	PR	209.1 ms	2.94 ms	0.53	1.66 KB	1.00

Artifacts:

• BDN_Artifacts.zip (10 KB)
• results.md (783 B)

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@MihaZupan

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dotnet/runtime#117792