Make sample projects compilable standalone

[kpavlov]

Describe the bug
Currently sample projects are viable only as a submodules of the main project.

To Reproduce
Steps to reproduce the behavior:

1. User clones the repo
2. cd samples/(project)
3. Build gradle project- it fails

Expected behavior

1. git clone
2. cd kotlin-sdk/samples/PROJECT
3. ./gradlew build
4. Success 🎉

Logs
If applicable, add logs to help explain your problem.

./gradlew kotlin-mcp-server:runJvm                                                                                                                                                 

Welcome to Gradle 8.14.3!
Starting a Gradle Daemon (subsequent builds will be faster)

> Task :kotlin-mcp-server:compileKotlinJvm FAILED
e: file:///Users/user/TestWorkspace/kotlin-sdk/samples/kotlin-mcp-server/src/commonMain/kotlin/server.kt:26:50 Unresolved reference 'ServerSession'.
e: file:///Users/user/TestWorkspace/kotlin-sdk/samples/kotlin-mcp-server/src/commonMain/kotlin/server.kt:98:48 Unresolved reference 'ServerSession'.
e: file:///Users/user/TestWorkspace/kotlin-sdk/samples/kotlin-mcp-server/src/commonMain/kotlin/server.kt:116:31 Unresolved reference 'onClose'.
e: file:///Users/user/TestWorkspace/kotlin-sdk/samples/kotlin-mcp-server/src/commonMain/kotlin/server.kt:124:60 Unresolved reference 'transport'.

DoD

1. Samples are still compiled with the main project (publishToMavenLocal + replace sdk.version to snapshot in build script)
2. Samples are continously compiled/tested as a separate GH workflow. sdk.version=latest released version