Introduce Test Scenarios for WASM (#182)

## Purpose
<!-- Describe the intention of the changes being proposed. What problem
does it solve or functionality does it add? -->
Introduce various test scenarios for CLI Test Runner and VSCode
Extension Test Explorer.
See samples/wasm/tests/README.md for more details

## Does this introduce a breaking change?
<!-- Mark one with an "x". -->
```
[ ] Yes
[x] No
```

## Pull Request Type

<!-- Please check the one that applies to this PR using "x". -->
```
[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Documentation content changes
[ ] Other... Please describe:
```

## How to Test
See samples/wasm/tests/README.md 

```
git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install
```

* Test the code
<!-- Add steps to run the tests suite and/or manually test -->
```
```

## What to Check
Verify that the following are valid
For CLI see:
https://github.com/Azure/vscode-tinykube/tree/main/cli#test-workflow
Run the command against each scenario

For VSCode Extension: 
- Open ~/explore-iot-operations/wasm as a VSCode workspace
- Go to "Test Explorer" tab and run each test scenario

## Other Information
For more info see: https://github.com/Azure/vscode-tinykube/tree/main

Author: yophilav

samples/wasm/README.md

@@ -9,6 +9,7 @@ This workspace is structured for the Azure IoT Operations VS Code extension so t
 - `graph-complex.yaml`, `graph-otel.yaml`, `graph-otel-transform.yaml`, `graph-simple.yaml` – additional graphs
 - `data/`, `data-and-images/`, `images/` – sample inputs; extension runs write output to `data-and-images/output`
 - `schema-registry-scenario/`, `statestore-scenario/` – scenario source code YAMLs for schema registry and state store usage
+- `tests/` – automated test cases for the CLI test runner and VS Code Test Explorer (auto-discovered when `wasm/` is opened as a workspace)
 - `Dockerfile`, `Makefile`, `.cargo/` – Rust builder assets co-located here (see **Rust builds**)
 - [`../wasm-python`](../wasm-python/README.md) – Python operator workspace; see its README for language-specific guidance
 

samples/wasm/tests/.gitignore

@@ -0,0 +1,2 @@
+# Test runner output directories
+**/output/

samples/wasm/tests/t01-simple-temp-conversion/expected/expected.json

@@ -0,0 +1,3 @@
+{
+  "payload": "{\"temperature\":{\"value\":653.8888888888889,\"count\":0,\"max\":0.0,\"min\":0.0,\"average\":0.0,\"last\":0.0,\"unit\":\"C\",\"overtemp\":false}}"
+}

samples/wasm/tests/t01-simple-temp-conversion/input/temperature_payload.json

@@ -0,0 +1,6 @@
+{
+    "temperature": {
+        "value": 1209,
+        "unit": "F"
+    }
+}

samples/wasm/tests/t01-simple-temp-conversion/t01-simple-temp-conversion.test.yaml

@@ -0,0 +1,6 @@
+name: "Temperature F to C conversion"
+graph: "../../graph-simple.yaml"
+input: "./input"
+expected: "./expected/expected.json"
+timeout: 90000
+select: ["payload"]

samples/wasm/tests/t02-complex-temp-pipeline/expected/expected.json

@@ -0,0 +1,3 @@
+{
+  "payload": "{\"temperature\":[{\"count\":1,\"max\":653.8888888888889,\"min\":653.8888888888889,\"average\":653.8888888888889,\"last\":653.8888888888889,\"unit\":\"C\",\"overtemp\":true}]}"
+}

samples/wasm/tests/t02-complex-temp-pipeline/input/temperature_payload.json

@@ -0,0 +1,6 @@
+{
+    "temperature": {
+        "value": 1209,
+        "unit": "F"
+    }
+}

samples/wasm/tests/t02-complex-temp-pipeline/t02-complex-temp-pipeline.test.yaml

@@ -0,0 +1,9 @@
+name: "Complex pipeline - temperature accumulation"
+graph: "../../graph-complex.yaml"
+input: "./input"
+expected: "./expected/expected.json"
+timeout: 120000
+select: ["payload"]
+ignores:
+  - "payload.humidity"
+  - "payload.object"

samples/wasm/tests/t03-complex-full-pipeline/expected/expected.json

@@ -0,0 +1,3 @@
+{
+  "payload": "{\"temperature\":[{\"count\":1,\"max\":1695.0,\"min\":1695.0,\"average\":1695.0,\"last\":1695.0,\"unit\":\"C\",\"overtemp\":true}],\"humidity\":[{\"count\":1,\"max\":85.0,\"min\":85.0,\"average\":85.0,\"last\":85.0}],\"object\":[{\"result\":\"American black bear, black bear, Ursus americanus, Euarctos americanus\"}]}"
+}