refactor(test): add centralized TypeScript server factory for integration tests (#477)

# refactor(test): add centralized TypeScript server factory for
integration tests

  - Create TypeScriptServer class for managing TypeScript MCP servers
  - Add dedicated typescript/ directory with server infrastructure
  - Refactor TsTestBase to use TypeScriptServer for stdio transport
- Extract TypeScript test tools (greet, multi-greet, prompts, resources)
  - Use npx tsx for direct execution (better performance than npm run)
  - Install TypeScript dependencies automatically in test setup

  The TypeScriptServer factory provides:
  - startSse(port): Start SSE transport server
  - startStdio(): Start STDIO transport server
  - stop(): Graceful server shutdown
  - installDependencies(): npm install automation

<!-- Provide a brief summary of your changes -->

## Motivation and Context
To resurrect typescript tests

## How Has This Been Tested?
Locally, CI

## Breaking Changes
<!-- Will users need to update their code or configurations? -->

## Types of changes
- [x] Bug fix (non-breaking change which fixes an issue)
- [x] Test fix

## 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
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
#475

conformance-test/build.gradle.kts

@@ -6,8 +6,8 @@ plugins {
 
 dependencies {
     testImplementation(project(":kotlin-sdk"))
-    testImplementation(kotlin("test"))
     testImplementation(project(":test-utils"))
+    testImplementation(kotlin("test"))
     testImplementation(libs.kotlin.logging)
     testImplementation(libs.ktor.client.cio)
     testImplementation(libs.ktor.server.cio)

conformance-test/src/test/kotlin/io/modelcontextprotocol/kotlin/sdk/conformance/ConformanceTest.kt

@@ -1,6 +1,7 @@
 package io.modelcontextprotocol.kotlin.sdk.conformance
 
 import io.github.oshai.kotlinlogging.KotlinLogging
+import io.modelcontextprotocol.kotlin.test.utils.findFreePort
 import org.junit.jupiter.api.AfterAll
 import org.junit.jupiter.api.BeforeAll
 import org.junit.jupiter.api.DynamicTest
@@ -10,7 +11,6 @@ import java.io.BufferedReader
 import java.io.InputStreamReader
 import java.lang.management.ManagementFactory
 import java.net.HttpURLConnection
-import java.net.ServerSocket
 import java.net.URI
 import java.util.concurrent.TimeUnit
 import kotlin.properties.Delegates
@@ -70,8 +70,6 @@ class ConformanceTest {
         private const val GRACEFUL_SHUTDOWN_SECONDS = 5L
         private const val FORCE_SHUTDOWN_SECONDS = 2L
 
-        private fun findFreePort(): Int = ServerSocket(0).use { it.localPort }
-
         private fun getRuntimeClasspath(): String = ManagementFactory.getRuntimeMXBean().classPath
 
         private fun getTestClasspath(): String = System.getProperty("test.classpath") ?: getRuntimeClasspath()