chore: Additional solution organization and sandbox.

[kinyoklion]

This set of changes shouldn't have any production facing impact. It just makes testing, validation, and development easier.

Extend the solution with the following capabilities:

• A DebugLocalReferences build configuration which locally links dependencies when possible. This is currently only redis and dynamo linking to the server SDK. It cannot yet link common locally because of its use by internal. Once internal is added to the solution it can be extended.
• Added documentation items to the individual project that use them as links. This allows more easy usage of things like README, CONTRIBUTING, and API docs from within a solution.
• Added top-level documentation to the repo-docs solution folder.

Added a new sandbox project that is configured with environment variables. So you can use different data system configurations based on environment variables. This includes persistent stores when using the DebugLocalReferences build.

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Note

Introduces local-dev build wiring and a new sandbox for easier testing while organizing solution items.

• Adds DebugLocalReferences configuration across projects to switch LaunchDarkly.ServerSdk from NuGet PackageReference to local ProjectReference; defines DEBUG_LOCAL_REFERENCES where needed
• Updates multiple .csproj files to include repo docs (README, CHANGELOG, etc.) as linked content; adds doc source links in server/server-ai/telemetry
• Adds sandbox/dotnet-server-sandbox console app configurable via environment variables for data system modes (default, streaming, polling, daemon, persistent-store) and persistent stores (Redis/DynamoDB) when using DebugLocalReferences
• Updates solution (DotnetCore.sln) to include sandbox and repo-docs folders and the new configuration entries; adjusts InternalsVisibleTo to dotnet-server-sandbox

^{Written by Cursor Bugbot for commit 8e2a733. This will update automatically on new commits. Configure here.}

[kinyoklion]

Once we have internal moved we can use this to link common/internal locally. Sever projects have these changes. The first pass tried to link locally all dependencies until I realized the internal dependent on common problem.

[kinyoklion]

bugbot review

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