Use DIRECT_METHOD_CALL macro in ILinksExtensions.h

[linksplatform-sweepai]

Description

This PR updates the Exists method in the ILinksExtensions class to use the DIRECT_METHOD_CALL macro. The DIRECT_METHOD_CALL macro allows for direct method calls on an object, bypassing virtual dispatch and improving performance. The Count method is now called using the DIRECT_METHOD_CALL macro, passing in the appropriate arguments.

Summary of Changes

• Replaced the call to the Count method in the Exists method with a call using the DIRECT_METHOD_CALL macro.
• Created a typename TStorage::LinkType object with the necessary arguments and passed it to the DIRECT_METHOD_CALL macro.
• Updated the return statement of the Exists method to compare the result of the DIRECT_METHOD_CALL with 0.

Please review and merge these changes at your earliest convenience.

Fixes #134.

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