Update mcp functions to use ServerSSESession with lambda receiver

[devcrocod]

Provide ServeSSESession as a context receiver.

Motivation and Context

How Has This Been Tested?

locally

Breaking Changes

Yes, changed signature for mcp server extensions

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

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 updates the MCP (Model Context Protocol) server functions to provide ServerSSESession as a context receiver instead of using a simple lambda. This change allows the lambda functions to access ServerSSESession properties and methods directly within their scope.

Key changes:

• Updated function signatures to use ServerSSESession.() -> Server instead of () -> Server
• Applied changes to all mcp() functions and the deprecated MCP() function
• Updated the internal mcpSseEndpoint function parameter accordingly

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
KtorServer.kt	Updated all mcp function signatures to use ServerSSESession as context receiver
kotlin-sdk.api	Updated API signatures from Function0 to Function1 to reflect the context receiver change

Comments suppressed due to low confidence (1)

src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/server/KtorServer.kt:74

• The function call block() is incorrect. Since the block parameter now has a ServerSSESession receiver, it should be called as block(this) or this.block() to provide the ServerSSESession context.

    val server = block()