Rename ClassLoadingUtil.load(String, Object) to loadFromContext

[Copilot]

The ClassLoadingUtil class had two overloaded load methods that dispatch based on static types (ClassLoader vs Object), creating ambiguity when the Object parameter is actually a ClassLoader or null.

Changes

• Renamed load(String className, Object context) → loadFromContext(String className, Object context) to clarify it extracts the ClassLoader from the context object's defining loader
• Updated call sites in example extensions (btrace-spark, btrace-hadoop) and documentation

Example

// Before: ambiguous which overload is called
Class<?> cls = ClassLoadingUtil.load("com.example.Class", someObject);

// After: intent is explicit
Class<?> cls = ClassLoadingUtil.loadFromContext("com.example.Class", someObject);

The load(String, ClassLoader) overload remains unchanged for direct ClassLoader usage.

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