Add tracing support for native method calls via Java FFM API

[amarziali]

What Does This Do

Introduces automatic tracing of native (downcall) method invocations made through the Java Foreign Function & Memory (FFM) API (available since JDK 22).

• Adds a new configuration option trace.native.methods that follows the same library[method1,method2] / library[*] format as trace.methods, letting users opt-in to tracing specific native calls.
• Instruments Linker.downcallHandle(MemorySegment, ...) to wrap the produced MethodHandle with span creation/finalization logic built using MethodHandles.tryFinally + MethodHandles.foldArguments — zero overhead when the handle is not traced.
• Instruments NativeLibrary to capture the library identity at when the symbol address is resolved. This allow to connect the dot when using:
  • Linker.defaultLookup()
  • Linker.loaderLookup()
  • SymbolLookup.libraryLookup(String name, Arena)
  • SymbolLookup.libraryLookup(Path path, Arena)
• Spans use operation name trace.native, component trace-ffm.
• The resource name is lib_name.symbol_name. The lib_name is lowercased. Does not contain path or extension

A note about the library name used to resolve syscalls. Java use internally libsyslookup. I don't know how portable is it. If yes we can strip this prefix. However, today, to say I'd like to trace strlen from the libc the user needs to say that want to trace libsyslookup[strlen]

Motivation

R&D week

Additional Notes

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Jira ticket: [PROJ-IDENT]

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