Refactor WebSocket dependency

[devcrocod]

Extracted WebSocket as an optional dependency of the core module

How Has This Been Tested?

Local test run

Breaking Changes

None

Types of changes

• 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
• Refactoring

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

[Copilot]

Pull Request Overview

This PR refactors the WebSocket dependency from a public API dependency to an implementation dependency in the core module, making it an optional/internal detail rather than part of the public API surface.

Key Changes:

• Changed WebSocket from api to implementation dependency in kotlin-sdk-core
• Added explicit WebSocket implementation dependencies to modules that need it (server, client test, and core test)

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
kotlin-sdk-core/build.gradle.kts	Changed ktor.server.websockets from api to implementation dependency
kotlin-sdk-server/build.gradle.kts	Added explicit implementation dependency on ktor.server.websockets
kotlin-sdk-client/build.gradle.kts	Added ktor.server.websockets to test dependencies
kotlin-sdk-test/build.gradle.kts	Added ktor.server.websockets to test dependencies

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