Add BenchmarkDotNet performance benchmarks using Dapr.Testcontainers

[Copilot]

Description

Adds a Dapr.Benchmarks project that uses BenchmarkDotNet with Dapr.Testcontainers to benchmark SDK operations against a real Dapr sidecar — no gRPC mocking required. Includes a separate non-blocking GitHub Actions workflow for informational tracking.

Benchmark project (test/Dapr.Benchmarks/)

• StateStoreBenchmarks — Save/Get/Delete with Small/Medium/Large payloads against Redis state store
• PubSubBenchmarks — Publish and end-to-end Publish+Receive via RabbitMQ
• WorkflowBenchmarks — Simple single-activity and fan-out (5 parallel activities) workflow execution
• DaprBenchmarkBase — Shared infrastructure managing DaprTestEnvironment lifecycle for [GlobalSetup]/[GlobalCleanup]
• All benchmarks use [MemoryDiagnoser] for allocation tracking

CI workflow (.github/workflows/benchmarks.yml)

• Triggers: master push, weekly schedule, workflow_dispatch
• Matrix: net8.0, net9.0, net10.0
• Uploads BenchmarkResults/ as artifacts (90-day retention)
• Not a release blocker — fully decoupled from sdk_build.yml

The project is IsPackable=false and the name Dapr.Benchmarks intentionally does not match the Dapr.*.Test.csproj / Dapr.IntegrationTest.*.csproj CI test discovery globs, so it won't be picked up by existing test jobs.

# Run all benchmarks
dotnet run -c Release --project test/Dapr.Benchmarks -- --filter '*'

# Single category on a specific TFM
dotnet run -c Release -f net10.0 --project test/Dapr.Benchmarks -- --filter '*StateStore*'

Issue reference

Informational benchmarking infrastructure — no prior issue.

Checklist

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[WhitWaldo]

@copilot Can you please resolve the merge conflict?

[Copilot]

@copilot Can you please resolve the merge conflict?

Resolved in de024a3. The conflict was in all.sln where both this branch and master (#1789 WorkflowRetryPolicy example) added project entries at the same location. Both entries are now included.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.37%. Comparing base (a5f2008) to head (aa8f98c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1793   +/-   ##
=======================================
  Coverage   62.37%   62.37%           
=======================================
  Files         285      285           
  Lines        8421     8421           
  Branches      980      980           
=======================================
  Hits         5253     5253           
  Misses       2935     2935           
  Partials      233      233           

Flag	Coverage Δ
net10.0	62.36% <ø> (ø)

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[WhitWaldo]

@copilot Can you please resolve the git merge conflicts?

[Copilot]

@copilot Can you please resolve the git merge conflicts?

Resolved in aa8f98c. The conflict was in all.sln where master added Dapr.IntegrationTest.Examples (#1792) and Dapr.IntegrationTest.Actors.Generators (#1791) at the same location as our Dapr.Benchmarks entry. All three project entries are now included.