remove the mention of onCloseCallback and replace it to onClose

[devcrocod]

Removed the mention of onCloseCallback, and replaced all uses of onCloseCallback to onClose.
Refactor the code to the 0.4.0 version of sdk

How Has This Been Tested?

Tested locally:

• ran all tests
• ran projects in samples

Breaking Changes

No breaking changes

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