fix conformance tests (#483)

# Fix conformance tests.

1. fix node version to workaround
https://github.com/nodejs/node/issues/56645
2. use `@argfile` to handle long classpaths
3. specify extension for npx for windows
4. Install `@modelcontextprotocol/conformance@0.1.8` GitHub Actions
workflow.
5. Centralize logging for process streams in conformance tests: Add
`startLogging` utility for InputStream logging with `KotlinLogging`.
Replace inline process stream handling with `startLogging` calls

Note: Currently tests pass using
`@modelcontextprotocol/conformance@0.1.8`/ But changing to 0.1.9 will
fail client scenarios (it is not related to this PR).

## Motivation and Context
Before fix conformance tests are broken on Windows

## How Has This Been Tested?
Run test locally and in github actions

## Breaking Changes
No

## Types of changes

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [x] I have added appropriate error handling
- [x] I have added or updated documentation as needed

## Additional context
May be we should update `CONTRIBUTING.md/Building/Requirements`. But
currently it does not mention at all: node, android, etc.

---------

Co-authored-by: f.bobin <f.bobin@vk.team>
Co-authored-by: Konstantin Pavlov <1517853+kpavlov@users.noreply.github.com>

test-utils/src/main/kotlin/io/modelcontextprotocol/kotlin/test/utils/platform.kt

@@ -1,3 +1,5 @@
 package io.modelcontextprotocol.kotlin.test.utils
 
 public val isWindows: Boolean = System.getProperty("os.name").lowercase().contains("windows")
+
+public val NPX: String = if (isWindows) "npx.cmd" else "npx"

test-utils/src/main/kotlin/io/modelcontextprotocol/kotlin/test/utils/processBuilders.kt

@@ -1,5 +1,10 @@
 package io.modelcontextprotocol.kotlin.test.utils
 
+import io.github.oshai.kotlinlogging.KLogger
+import java.io.BufferedReader
+import java.io.InputStream
+import java.io.InputStreamReader
+
 public fun createTeeProcessBuilder(): ProcessBuilder = if (isWindows) {
     ProcessBuilder("cmd", "/c", "findstr", "^")
 } else {
@@ -11,3 +16,30 @@ public fun createSleepyProcessBuilder(): ProcessBuilder = if (isWindows) {
 } else {
     ProcessBuilder("sh", "-c", "sleep 1 && echo 'simulated error' >&2 && exit 1")
 }
+
+/**
+ * Starts logging the lines from this InputStream to a specified logger.
+ * Each line from the InputStream is read and logged using the provided logger
+ * at the debug level, optionally with an additional prefix string appended
+ * to each logged line. The method runs the logging process in a separate daemon thread.
+ *
+ * @param logger The logger used to log the lines from the InputStream.
+ * @param name The name to assign to the daemon thread handling the logging process.
+ */
+public fun InputStream.startLogging(logger: KLogger, name: String) {
+    val stream = this
+    Thread {
+        try {
+            BufferedReader(InputStreamReader(stream)).use { reader ->
+                reader.lineSequence().forEach { line ->
+                    logger.debug { line }
+                }
+            }
+        } catch (e: Exception) {
+            logger.trace(e) { "Error reading server test stdout" }
+        }
+    }.apply {
+        this.name = name
+        isDaemon = true
+    }.start()
+}