Restructure entity examples as standalone apps with DTS emulator support

[Copilot]

Entity examples were single TypeScript files in hello-world/, making them difficult to test against the DTS emulator. They needed proper app structure with package management.

Changes

Standalone App Structure

• Moved entity-counter and entity-orchestration to separate directories with package.json, index.ts, and README.md
• Replaced TaskHubGrpcClient with DurableTaskAzureManagedClientBuilder for DTS emulator compatibility
• Added start:emulator npm scripts configuring ENDPOINT=localhost:8080 and TASKHUB=default

Environment Configuration

const endpoint = process.env.ENDPOINT || "localhost:4001";
const taskHub = process.env.TASKHUB || "default";

const client = new DurableTaskAzureManagedClientBuilder()
  .endpoint(endpoint)
  .taskHubName(taskHub)
  .useGrpc()
  .build();

Documentation

• Created examples/README.md documenting all examples and testing approaches
• Created examples/TESTING.md with DTS emulator testing instructions
• Updated examples/hello-world/README.md to reflect moved examples

Examples now run against DTS emulator:

docker run --name dts-emulator -i -p 8080:8080 -d --rm mcr.microsoft.com/dts/dts-emulator:latest
cd examples/entity-counter && npm run start:emulator

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

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• node-precompiled-binaries.grpc.io
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