aspectran / aspectran / #4728

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Refactor AspectRegistry for performance and thread-safety

This commit refactors core components of the aspect registry for improved performance, thread-safety, and clarity.

The RelevantAspectRuleHolder is now an immutable object to ensure it can be safely shared and cached in a concurrent environment. This change adheres to the project's convention of using null for empty collections to minimize object allocation and GC pressure.

Key improvements in AdviceRuleRegistry:
 - Fixed a major O(n^2) performance issue in find...Index methods by using a for-each loop for LinkedList iteration.
 - Corrected the use of ArrayList to LinkedList for addFirst operations to ensure O(1) complexity.
 - Improved code clarity with a switch statement and better variable naming.

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