[AI] Fix DTLS config override issue with finishWithCloseNotify

[ic0ns]

Summary

• Fixes issue where -version DTLS12 parameter always sets finishWithCloseNotify to true, overriding XML configuration
• Adds new -close_notify parameter for explicit control of this setting
• Preserves XML configuration values when using -version parameter

Changes

1. Modified ProtocolVersionDelegate: Removed automatic setting of finishWithCloseNotify for DTLS versions
2. Added CloseNotifyDelegate: New delegate to handle -close_notify parameter explicitly
3. Updated Command Configs: Added CloseNotifyDelegate to both TLS-Server and TLS-Client
4. Added Tests: Comprehensive tests for the new delegate and verification that DTLS doesn't override settings

Test plan

• Added unit test for CloseNotifyDelegate
• Added test to verify DTLS version doesn't override finishWithCloseNotify
• All existing tests pass
• Code formatted with spotless

Usage

Users can now:

• Use XML config: <finishWithCloseNotify>false</finishWithCloseNotify> works with -version DTLS12
• Use command line: -close_notify true/false to override any config setting
• Omit both for default behavior (false)

Fixes #182