Support a custom SymbolProvider in NativeLibrary

[soywiz]

This allows to do function hooking/replacement while still using direct mapping.

In addition to that, to properly using the OpenGL library on Windows, and access OpenGL >= 2.0, we need to use a custom getSymbol function: https://learn.microsoft.com/en-us/windows/win32/api/wingdi/nf-wingdi-wglgetprocaddress

Relevant information:

• DirectGL on Win32. Hugely reduces OpenGL overhead on windows JVM korlibs/korge#1140
• Include custom symbol resolver to JNA: glGetProcAddress Win32 DirectGL korlibs/korge#541

I have run already the tests here:
https://github.com/korlibs/jna/actions/runs/3601244855

In the test I'm switching cos and sin functions to show it works.

[soywiz]

Started a thread here: https://groups.google.com/g/jna-users/c/RDt8sHAnTm0