Add extensions

[matteo8p]

Add extensions to the Typescript SDK types

Motivation and Context

Extensions are now merged
modelcontextprotocol/modelcontextprotocol#2133

How Has This Been Tested?

Tests ran.

Breaking Changes

No

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

Additional context

[changeset-bot]

⚠️ No Changeset found

Latest commit: a99dd85

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[pkg-pr-new]

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@modelcontextprotocol/client

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@modelcontextprotocol/server

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@modelcontextprotocol/express

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@modelcontextprotocol/hono

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1475

@modelcontextprotocol/node

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1475

commit: a99dd85